EXHIBIT 5.1


                                                              January 24, 2006

CBS Corporation
51 West 52nd Street
New York, NY 10019

Dear Sirs:

                  I am the Senior Vice President, Deputy General Counsel and
Secretary of CBS Corporation, a Delaware corporation ("CBS"). I am delivering
this opinion in connection with the Registration Statement on Form S-8 (the
"Registration Statement") of CBS filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended, with respect to the
registration of 8,500,000 shares of CBS's Class B Common Stock, par value $0.001
per share (the "Shares"), to be issued and sold under the following plans (the
"Plans"): (i) CBS Corporation 1993 Long-Term Incentive Plan, (ii) CBS
Corporation 1991 Long-Term Incentive Plan, (iii) Infinity Broadcasting
Corporation Stock Plan for Directors, (iv) Infinity Broadcasting Corporation
1999 Long-Term Incentive Plan, (v) Infinity Broadcasting Corporation 1998
Long-Term Incentive Plan, (vi) Infinity Broadcasting Corporation Stock Option
Plan, (vii) Outdoor Systems, Inc. 1996 Omnibus Plan, (viii) King World
Salesforce Bonus Plan, (ix) King World Productions, Inc. and its Subsidiaries
1998 Stock Option and Restricted Stock Purchase Plan, (x) King World
Productions, Inc. 1996 Amended and Restated Stock Option and Restricted Stock
Purchase Plan, (xi) King World Productions, Inc. Stock Option Agreement with
Oprah Winfrey dated as of March 17, 1994, (xii) King World Productions, Inc.
Stock Option Agreement with Jeffrey D. Jacobs dated as of March 17, 1994, (xiii)
King World Productions, Inc. Stock Option Agreement with Oprah Winfrey dated as
of October 6, 1995, (xiv) King World Productions, Inc. Stock Option Agreement
with Jeffrey D. Jacobs dated as of October 6, 1995, (xv) King World Productions,
Inc. Stock Option Agreement with Oprah Winfrey dated as of September 15, 1997,
(xvi) King World Productions, Inc. Stock Option Agreement with Jeffrey D. Jacobs
dated as of September 15, 1997, (xvii) King World Productions, Inc. Stock Option
Agreement with Oprah Winfrey dated as of September 16, 1998, (xviii) King World
Productions, Inc. Stock Option Agreement with Jeffrey D. Jacobs dated as of
September 16, 1998, (xix) King World Productions, Inc. Stock Option Agreement
with Timothy Bennett dated as of September 16, 1998, (xx) King World
Productions, Inc. Stock Option Agreement with Dianne Hudson dated as of
September 16, 1998, and (xxi) King World Productions, Inc. Stock Option
Agreement with Douglas Pattison dated as of September 16, 1998.

                  In connection with the foregoing, I or members of my legal
staff (my "Staff") have examined the Registration Statement, the Plans, and the
originals, or copies certified to my or my Staff's satisfaction, of such
records, documents, certificates and other instruments as I or my Staff have
deemed necessary or appropriate to enable me to render the opinion expressed
below. As to questions of fact material to the opinion expressed below, I or my
Staff have, when relevant facts were not independently established by me or
them, relied upon certificates of officers of CBS or other evidence



satisfactory to me or my Staff. In all such examinations, I or my Staff have
assumed the genuineness of all signatures on original and certified documents,
the legal capacity of all natural persons, the authenticity of all documents
submitted to me or my Staff as original documents and the conformity to original
or certified documents submitted to me or my Staff as copies.

                  I am a member of the bar of the State of New York and the
opinion expressed herein is limited to matters controlled by the laws of the
State of New York and the General Corporation Law of the State of Delaware.

                  Based upon the foregoing, it is my opinion that the Shares
have been duly authorized by CBS and, when issued and delivered by CBS in
accordance with the terms of the Plans, the Shares will be validly and
legally issued, fully paid and non-assessable under the laws of the State of
Delaware.

                  I hereby consent to the filing of this opinion as an exhibit
to the Registration Statement.

                                                       Very truly yours,

                                                       /s/ Angeline C. Straka
                                                     --------------------------
                                                       Angeline C. Straka