Exhibit 5.1

                  [Letterhead of Simpson Thacher & Bartlett]




                                                            March 9, 1998


Ingersoll-Rand Company
Ingersoll-Rand Financing I
c/o Ingersoll Rand Company
200 Chestnut Ridge Road
Woodcliff Lake, New Jersey  07675

Ladies and Gentlemen:

              We have acted as counsel to Ingersoll-Rand Company, a New

Jersey corporation (the "Company"), and Ingersoll-Rand Financing I, a

Delaware statutory business trust (the "Trust"), in connection with the

Registration Statement on Form S-3 (the "Registration Statement") filed by

the Company with the Securities and Exchange Commission (the "Commission")

under the Securities Act of 1933, as amended, relating to (i) common stock,

par value $2 per share (the "Common Stock"), of the Company, (ii) debentures

of the Company (the "Trust Debentures") to be purchased by the Trust with the

proceeds from the sale of capital securities representing undivided

beneficial ownership interests in the Trust (the "Capital Securities"), (iii)

stock purchase contracts of the Company to purchase Common Stock (the "Stock

Purchase Contracts"), (iv) stock purchase units of the Company, each

representing ownership of (x) a Stock Purchase Contract and (y) a beneficial

interest in the Capital Securities or debt obligations of third parties,

including U.S. Treasury Securities, securing the holder's obligation to

purchase Common Stock under the Stock Purchase Contracts (the "Stock Purchase

Units"), (v) guarantees of certain payment obligations with respect to the

Capital Securities by the Company to be executed by the Company and The First

National Bank of Chicago, as guarantee trustee (the "Guarantees") and (vi)

the Capital Securities of the Trust, each (i) through (vi) to be issued and

sold by the Company or the Trust, as applicable, from time to time pursuant

to Rule 415 under the Act for an aggregate initial offering price not to

exceed $600 million.

              We have examined (i) the Registration Statement, (ii) the form

of Indenture to be executed by the Company and The Bank of New York, as

trustee (the "Trust Debenture Indenture") and (iii) the form of Guarantee

Agreement to be executed by the Company and The First National Bank of

Chicago, as guarantee trustee (the "Guarantee Agreement").   In addition, we

have examined, and have relied as to matters of fact upon, the originals or

copies, certified or otherwise identified to our satisfaction, of such

corporate records, agreements, documents and other instruments and such

certificates or comparable documents of public officials and of officers and

representatives of the Company and the Trust, and have made such other and

further investigations, as we have deemed relevant and necessary as a basis

for the opinions hereinafter set forth.

              In such examination, we have assumed the genuineness of all

signatures, the legal capacity of natural persons, the authenticity of all

documents submitted to us as originals, the conformity to original documents

of all documents submitted to us as certified or photostatic copies, and the

authenticity of the originals of such latter documents.  

              We have also assumed that (i) the Registration Statement, and

any amendments thereto (including post-effective amendments), including the

form of prospectus included therein (as supplemented, the "Prospectus"), will

have become effective under the Act, (ii) one or more prospectus supplements

will have been prepared and filed with the Commission describing the Trust

Debentures, the Stock Purchase Contracts and/or the Guarantees offered

thereby, (iii) all Trust Debentures, Stock Purchase Contracts and Guarantees

issued will be issued and sold in compliance with applicable federal and

state securities laws and solely in the manner stated in the Registration

Statement and the appropriate prospectus supplement, and (iv) a definitive

purchase, underwriting or similar agreement or stock purchase contract with

respect to any Trust Debentures, Stock Purchase Contracts or Guarantees

offered will have been duly authorized and validly executed and delivered by

the Company and the other parties thereto.

              Based upon the foregoing, and subject to the qualifications and

limitations stated herein, we are of the opinion that:

                      1.     With respect to the Trust Debentures to be issued
       under the Trust Debenture Indenture, when (i) the Trust Debenture
       Indenture has been duly authorized, executed and delivered by the
       Company to the trustee in accordance with applicable law, (ii) the
       Trust Debenture Indenture has been duly qualified under the Trust
       Indenture Act of 1939, as amended (the "Trust Indenture Act"), (iii)
       the Board of Directors of the Company, a duly constituted and acting
       committee of such Board or duly authorized officer of the Company
       (such Board of Directors, committee or authorized officer being
       hereinafter referred to as the "Board"), has taken all necessary
       corporate action to approve the issuance and terms of such Trust
       Debentures, the terms of the offering thereof and related matters in
       accordance with applicable law and (iv) such Trust Debentures have
       been duly executed, authenticated, issued and delivered in accordance
       with the provisions of the Trust Debenture Indenture and applicable
       law and upon payment of the consideration therefor provided for in the
       applicable definitive purchase, underwriting or similar agreement
       approved by the Board, such Trust Debentures will constitute valid and
       legally binding obligations of the Company, enforceable against the
       Company in accordance with their terms. 

                      2.     With respect to the Stock Purchase Contracts,
       when (i) the Board has taken all necessary corporate action to approve
       the issuance and terms of such Stock Purchase Contracts, the terms of
       the offering thereof and related matters in accordance with applicable
       law and (ii) such Stock Purchase Contracts have been duly executed,
       issued and delivered in accordance with applicable law and upon
       payment of the consideration therefor provided for in the applicable
       definitive purchase, underwriting or similar agreement approved by the
       Board, such Stock Purchase Contracts will constitute valid and legally
       binding obligations of the Company, enforceable against the Company in
       accordance with their terms.

                      3.     With respect to the Guarantees, when (i) the
       Guarantee Agreement has been duly authorized, executed and delivered
       by the Company to the guarantee trustee in accordance with applicable
       law, (ii) the Guarantee Agreement has been duly qualified under the
       Trust Indenture Act in accordance with applicable law, (iii) the Board
       has taken all necessary corporate action to approve the issuance and
       terms of such Guarantees, the terms of the offering thereof and
       related matters in accordance with applicable law and (iv) such

       Guarantees have been duly executed, issued and delivered in accordance
       with applicable law and in accordance with the provisions of the
       Guarantee Agreement and the applicable definitive purchase,
       underwriting or similar agreement approved by the Board upon payment
       of the consideration therefore provided for therein, such Guarantees
       will constitute valid and legally binding obligations of the Company
       enforceable against the Company in accordance with their terms.

              Our opinions set forth above are subject to the effects of

bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and

other similar laws relating to or affecting creditors' rights generally,

general equitable principles (whether considered in a proceeding in equity or

at law) and an implied covenant of good faith and fair dealing.

              We are members of the Bar of the State of New York and we do

not express any opinion herein concerning any law other than the law of the

State of New York and the federal law of the United States.

              We hereby consent to the filing of this opinion of counsel as

Exhibit 5.1 to the Registration Statement and to the use of our name under

the caption "Legal Matters" in the Prospectus forming a part of the

Registration Statement.

                                           Very truly yours,


                                           /s/ Simpson Thacher & Bartlett


                                           SIMPSON THACHER & BARTLETT