MDU RESOURCES
          GROUP, INC.                                  Exhibit 5(a)
          ------------------------------------------------------------
          Schuchart Building
          918 East Divide Avenue
          
          Mailing Address:
          P.O. Box 5650
          Bismarck, ND  58506-5650
          (701) 222-7900


                                             February 18, 1999

          MDU Resources Group, Inc.
          Schuchart Building
          918 East Divide Avenue
          P.O. Box 5650
          Bismarck, North Dakota  58501

          
          Ladies and Gentlemen:

                    With reference to the Registration Statement on Form S-
          8 (the "Registration Statement") to be filed on or about the date
          hereof with the Securities and Exchange Commission by MDU
          Resources Group, Inc. (the "Company") under the Securities Act of
          1933, as amended, and pursuant to which the Company intends to
          register one (1) additional share of its Common Stock, par value
          $3.33 (the "Stock") and the Preference Share Purchase Right
          attached thereto (together with the Preference Share Purchase
          Rights attached to the shares of the Company's Common Stock,
          which shares of Common Stock are being moved and carried forward
          to the Registration Statement from Registration Statement No.
          333-06103 and Registration Statement No. 333-06105, the
          "Rights"), for offer and sale in connection with the MDU
          Resources Group, Inc. 401(k) Retirement Plan, it is my opinion
          that: 

                    1.   When

                    (a)  appropriate authorizations by the Federal Energy
                         Regulatory Commission, the Montana Public Service
                         Commission and the Public Service Commission of
                         Wyoming with respect to the issuance and sale of
                         the Stock shall have been granted;

                    (b)  the Company's Board of Directors or a duly
                         authorized committee thereof shall have approved
                         the issuance and sale of the Stock by the Company;
                         and

                    (c)  the Stock shall have been duly issued and
                         delivered for the consideration set forth in the
                         aforesaid Registration Statement and in accordance
                         with the actions hereinabove mentioned, the Stock
                         will be validly issued, fully paid and non-
                         assessable.

                    2.   The Rights, when issued as contemplated by the
          Registration Statement, will be validly issued.

                    I am a member of the North Dakota and Montana Bars and
          do not hold myself out as an expert on the laws of any other
          jurisdiction.  Except as set forth in paragraph 1(a) above, my
          opinions expressed above are limited to the laws of the States of
          North Dakota and Montana.  Insofar as the opinions expressed
          herein relate to the laws of the State of New York, the General
          Corporation Law of the state of Delaware, or and the Federal laws
          of the United States of America, I have relied on the opinion of
          even date herewith, of Thelen Reid & Priest LLP, counsel to the
          Company, which opinion is to be filed as an exhibit to the
          Registration Statement.

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

                                        Very truly yours,

                                        /s/ Lester H. Loble, II
                                                                
                                        Lester H. Loble, II
                                        General Counsel
                                        and Secretary