EXHIBIT 10-D

                   
                  	     MENTOR GRAPHICS CORPORATION

           	   1987 NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

Mentor Graphics recognizes that its continuing success depends upon the
initiative, ability and significant contributions of non-employee directors.
Mentor Graphics believes that by affording its non-employee directors the
opportunity to purchase shares of Mentor Graphics it will enhance its
ability to attract and retain non-employee directors and will exert their
best efforts on its behalf.

    The Plan is as follows:

1.  Shares Subject to Option.

    1.1  Options granted under this Plan shall be for authorized but
unissued or reacquired Common Stock of Mentor Graphics.

    1.2  Options may be granted under sections 5 and 6 of the Plan for a
total of not more than 1,100,000 shares of Common Stock, subject to
adjustment under section 11.  Shares subject to options that are terminated
or expire without being exercised, other than options that are surrendered
upon exercise of a related stock appreciation right, shall be added to the
shares remaining for future options.

2.  Effective Date; Duration.

		This Plan shall be effective May 21, 1987 and continue until options
covering all of the available shares have been granted and exercised unless
sooner terminated by the Board of Directors of Mentor Graphics (Board).
Expiration or termination of the Plan shall not affect outstanding options
or stock appreciation rights.

3.  Eligibility; Non-Employee Directors.

	Options may be granted under this Plan only to persons who are or have
been elected as Non-Employee Directors of Mentor Graphics.  A "Non-Employee
Director" is a director who is not otherwise an employee of Mentor Graphics
or any of its subsidiaries and has not been an employee of Mentor Graphics
or any of its subsidiaries within 2 years of any date as determination of
eligibility is made.

4.  Administration.

    4.1  The Plan shall be administered in accordance with the express
provisions of the Plan by a compensation committee appointed by the Board
(Committee).  The Committee may delegate any of its administrative duties
to one or more agents and may retain advisors to assist it.

	4.2  The Committee shall have general responsibility to interpret and
administer the Plan and shall have authority to adopt rules and to make
other determinations not inconsistent with the Plan deemed necessary for
the administration of the Plan.  Any decision of the Committee shall be
final and bind all parties.  Notwithstanding the foregoing, the Committee's
exclusive power to make final and binding interpretations of the Plan shall
immediately terminate upon the occurrence of a Change in Control (as defined
in section 8.2).

	4.3   No Committee member shall participate in the decision of any
question relating exclusively to an option granted to that member.

5.  Non-Discretionary Annual Option Grants.

	On the date of each annual meeting of shareholders of Mentor Graphics
beginning with the annual meeting held in 1987 (Grant Dates), each
Non-Employee Director elected at the annual meeting who served as a director
continuously since the prior annual meeting shall be automatically granted
an option to purchase 10,000 shares of Common Stock of Mentor Graphics.
Any incumbent Non-Employee Director elected at an annual meeting who did not
serve as a director for the full period since the prior annual meeting shall
instead be automatically granted an option for a pro rata portion of 10,000
shares based on the number of full or partial months during the period that
the director did serve.  A Non-Employee Director elected Chairman at an
annual meeting who served as Chairman of the Board continuously since the
prior annual meeting shall be automatically granted an additional option to
purchase 2,500 shares.  Any incumbent Non-Employee Director elected Chairman
at an annual meeting who did not serve as Chairman for the full period shall
instead be granted an option for a pro rata portion of shares based on the
number of full or partial months during the period that the director did serve
as Chairman.  If the number of shares available for grant is insufficient
to make all automatic grants required on any Grant Date, the number of
shares for which options are granted to each Non-Employee Director shall
be proportionately reduced.

6.   Non-Discretionary Option Grants for New Directors.

	An option to purchase 30,000 shares of Common Stock shall be automatically
granted to any person who (i) is elected a director of Mentor Graphics, (ii)
has not previously served as a director of Mentor Graphics, and (iii) at the
time of the initial election, qualifies as a Non-Employee Director under
section 3.  The automatic grant of an option under this section 6 shall
occur on the date the new Non-Employee Director is first elected as a
director (Grant Date).

7.   Terms of Options.

		Each option granted under this Plan shall have the following provisions:

	7.1  Price.  The exercise price of the option shall be equal to the last
price for the Common Stock reported on the Grant Date in the NASDAQ National
Market System.  If the Common Stock is no longer quoted in the NASDAQ
National Market System, the exercise price shall be equal to the fair market
value of the Common Stock determined in a reasonable manner specified
by the Committee.

   7.2  Term.   The term of the option shall be 10 years from the Grant Date. 

   7.3     Time of Exercise; Option Year.

		7.3.1   Until it expires or is terminated and except as provided in
section 7.3.2, the option may be exercised from time to time to purchase
shares up to the following limits:

		    Years After                     Percent
		    Grant Date                      Exercisable

		    Less than 1                         0
   			1 to 2                              20%
		    2 to 3                              40%
		    3 to 4                              60%
		    4 to 5                              80%
			   over 5                              100%

		7.3.2  On death the exercise limit will be at least 50 percent.

		7.3.3  The table in section 7.3.1 is based on an Option Year.  An Option
Year is a 12-month period starting on the Grant Date or an anniversary of
that date.

  7.4    Continuation as Director.

		7.4.1  If an optionee ceases to be a director for any reason, an Option
Reference Date will be established.  Any portion of the option that is not
exercisable on the Option Reference Date will lapse.  The Option Reference
Date will be fixed as follows:

	  (a)   If the termination is by death or disability, the first
		day of the next Option Year will be the Option Reference Date.

	  (b)   In all other cases, the optionee's last day as a director
		will be the Option Reference Date.

		7.4.2  Any portion of the option that is exercisable on the Option
Reference Date may be exercised up to the earlier of the last day of the
term of the option or a date fixed as follows:

	  (a)   If the termination is by death or disability, one year after
		the last day as a director.

	  (b)   In all other cases, one month after the Option Reference Date.

	7.5   Payment of Exercise Price.  At the time of exercise of an option,
the full exercise price must be paid in cash or by delivery of Common Stock
of Mentor Graphics valued at fair market value, which shall be the last sale
price for the Common Stock reported on the NASDAQ National Market System on
the trading day immediately preceding the date of exercise or such other
price as would be determined by the method used under section 7.1.

  7.6   Nonassignability.  The option may not be assigned or transferred
except on death, by will or operation of law.  The option may be exercised
only by the optionee or by a successor or representative after death.

8.  Acceleration Upon Change in Control.

  8.1   Notwithstanding any limitation on exercisability contained in any
option agreement or in the Plan, each outstanding option shall automatically
become exercisable in full for the remainder of its term upon the occurrence
of a Change in Control.

	8.2   "Change in Control" means the occurrence of any of the following
events:

		8.2.1   the approval by the shareholders of Mentor Graphics of:

			(a)   any consolidation, merger or plan of share exchange
involving Mentor Graphics (Merger) in which Mentor Graphics is not the
continuing or surviving corporation or pursuant to which shares of Common
Stock would be converted into cash, securities or other property, other than
a Merger involving Mentor Graphics in which the holders of Mentor Graphics'
Common Stock immediately prior to the Merger have the same proportionate
ownership of Common Stock of the surviving corporation immediately after the
Merger;

			(b)   any sale, lease, exchange or other transfer (in one
transaction or a series of related transactions) of all, or substantially
all, the assets of Mentor Graphics; or

			(c)   the adoption of any plan or proposal for the liquidation
or dissolution of Mentor Graphics;

		8.2.2   at any time during a period of two consecutive years,
individuals who at the beginning of such period constituted the Board of
Directors (Incumbent Directors) shall cease for any reason to constitute at
least a majority thereof, unless each new director elected during such
two-year period was nominated or appointed by two-thirds of the Incumbent D
office and voting (new directors nominated or appointed by two-thirds of
the Incumbent Directors shall also be deemed to be Incumbent Directors); or

		8.2.3   any person (as such term is used in Section 13(d) of the
Securities Exchange Act of 1934 (1934 Act) shall, as a result of a tender or
exchange offer, open market purchases, privately negotiated purchases or
otherwise, have become the beneficial owner (within the meaning of
Rule 13d-3 under the 1934 Act), directly or indirectly, of securities of
Mentor Graphics ordinarily having the right to vote in the election of
directors (Voting Securities) representing twenty percent (20%) or more of
the combined voting power of the then outstanding Voting Securities.

9.   Limited Stock Appreciation Rights.

     9.1     Each option granted under the Plan shall include a related
limited stock appreciation right. Effective as of December 14, 1988 and
subject to shareholder approval of the amendment to the Plan adding this
section 9, a limited stock appreciation right is automaticaly granted tandem
with each option outstanding under the Plan on December 14, 1988.

     9.2     Limited stock appreciation rights shall be exercisable only
during the 60 calendar days immediately following a Change in Control and
only if the immediate resale of shares acquired upon exercise of the related
option would subject the optionee to liability under Section 16(b) of
the 1934 Act, provided, however, that a limited stock appreciation right
may not be exercised within six months of its date of grant.  Upon exercise
of a limited stock appreciation right, the option or portion thereof to
which the right relates must be surrendered.  The shares subject to an
option or portion thereof that is surrendered upon exercise of a limited
stock appreciation right shall not be available for future option grants
under the Plan.
	
     9.3     Each limited stock appreciation right shall entitle the holder
to receive from Mentor Graphics an amount equal to the excess of the fair
market value at the time of exercise of one share of Mentor Graphics Common
Stock over the option price per share under the related option, multiplied
by the number of shares covered by the related option or portion of the
related option.

     9.4     Payment upon exercise of a limited stock appreciation right
by Mentor Graphics may be made only in cash.

	9.5     Limited stock appreciation rights may not be assigned or
transferred except on death, by will or operation of law and may be
exercised only by the holder or by a successor or representative after death.

10.  Option Agreement.

	Each option shall be evidenced by a stock option agreement which shall set
forth the number of shares for which the option was granted, the provisions
called for in section 7, 8 and 9 relating to the option, and such other
terms and conditions consistent with the Plan as the Committee shall
determine from time to time.



11.  Changes in Capital Structure.

	If any change is made in the outstanding Common Stock without Mentor
Graphics receiving any consideration, such as a stock split, reverse stock
split, stock dividend, or combination or reclassification of the Common
Stock, corresponding changes shall be made in the number of shares remaining
available for option under section 1, without any further approval of the
shareholders.  Fractional shares shall be disregarded.  The adjustment
shall be made by the Committee whose determination shall be conclusive.  No
corresponding changes shall be made to the number of shares for which
automatic grants are made under sections 5 and 6; provided, however, that
stock option agreements evidencing options may provide that the number shares
issuable under outstanding options and the exercise price of such options
shall be appropriately adjusted in the event of changes in capital structure
covered by this Section 11.

12.   Amendment or Termination of the Plan.

   12.1  The Board may amend or terminate this Plan at any time subject to
section 12.2.

	12.2  Unless the amendment is approved by the shareholders, no amendment
shall be made in the Plan that would (a) increase the total number of shares
available for option grants under section 1 or the number of shares for
which automatic grants are made under section 5 or section 6, (b) increase
the term for which options are granted, (c) change the formula for
determining the exercise price of options to provide a lower exercise price,
(d) modify the requirements for eligibility under the Plan, or (e)
materially increase the benefits accruing under the Plan.