EXHIBIT 5.1


                      [KELLER ROHRBACK L.L.P. LETTERHEAD]



                               November 14, 2006



Board of Directors
WSB Financial Group, Inc.
607 Pacific Avenue
Bremerton, WA  98337

Gentlemen:

     We are  acting as  counsel  to WSB  Financial  Group,  Inc.,  a  Washington
corporation  (the "Company"),  in connection with its registration  statement on
Form  S-1,  as  amended   (Registration  No.   333-137038)  (the   "Registration
Statement"),  filed with the Securities and Exchange  Commission relating to the
proposed public offering of up to 2,645,000 shares (including the over-allotment
option) of the Company's  common stock,  par value $1.00 per share, all of which
shares (the  "Shares")  are to be sold by the Company.  This  opinion  letter is
furnished  to you at your request to enable you to fulfill the  requirements  of
Item 601(b)(5) of Regulation S-K, 17 C.F.R. Section 229.601(b)(5), in connection
with the Registration Statement.

     For  purposes  of this  opinion  letter,  we have  examined  copies  of the
following documents:

     1. An executed copy of the Registration Statement.

     2. The  Articles  of  Incorporation  of the  Company,  with all  amendments
thereto,  as certified by the Secretary of State of the State of Washington  and
by the  Secretary  of the  Company  as of the date  hereof  as  being  complete,
accurate and in effect.

     3. The Bylaws of the Company,  as certified by the Secretary of the Company
as of the date hereof as being complete, accurate and in effect.

     4. The proposed form of Underwriting Agreement between the Company and D.A.
Davidson  &  Co.,  as  underwriter,  and  the  several  underwriters  as  may be
designated  pursuant  to  Schedule  I  thereto,  filed  as  Exhibit  1.1  to the
Registration Statement (the "Underwriting Agreement").


Board of Directors
WSB Financial Group, Inc.                               KELLER ROHRBACK L.L.P.
November 14, 2006
Page 2



     5. A resolution of the Board of Directors of the Company  adopted on August
21, 2006,  as  certified  by the  Secretary of the Company on the date hereof as
being complete, accurate and in effect, relating to the issuance and sale of the
Shares and arrangements in connection therewith.

     In  our  examination  of the  aforesaid  documents,  we  have  assumed  the
genuineness of all signatures,  the legal capacity of all natural  persons,  the
accuracy and completeness of all documents  submitted to us, the authenticity of
all original  documents,  and the conformity to authentic  original documents of
all documents  submitted to us as copies  (including  telecopies).  This opinion
letter is given,  and all  statements  herein  are made,  in the  context of the
foregoing.

     This opinion  letter is based as to matters of law solely on the Washington
Business  Corporation  Act, as amended.  We express no opinion  herein as to any
other laws, statutes, ordinances, rules or regulations.

     Based upon, subject to and limited by the foregoing,  we are of the opinion
that  following (i)  execution  and delivery by the Company of the  Underwriting
Agreement, (ii) effectiveness of the Registration Statement,  (iii) final action
of the  Board of  Directors  (or a duly  authorized  committee  thereof)  of the
Company  approving  the  price  of  the  Shares  to  be  sold  pursuant  to  the
Underwriting Agreement, (iv) issuance of the Shares pursuant to the terms of the
Underwriting Agreement,  and (v) receipt by the Company of the consideration for
the Shares pursuant to the terms of the Underwriting Agreement,  the Shares will
be validly issued, fully paid and non-assessable.

     This opinion  letter has been  prepared  solely for your use in  connection
with the filing of the Registration  Statement and speaks as of the date hereof.
We assume no obligation to advise you of any changes in the foregoing subsequent
to the delivery of this opinion letter.

     We hereby  consent to the filing of this  opinion  letter as Exhibit 5.1 to
the  Registration  Statement and to the reference to this firm under the caption
"Legal  Matters"  in the  prospectus  constituting  a part  of the  Registration
Statement.  In giving this opinion and  consent,  we do not admit that we are an
"expert" within the meaning of the Securities Act of 1933, as amended.


                                  Very truly yours,

                                  /s/ Keller Rohrback L.L.P.
                                  --------------------------
                                  KELLER ROHRBACK L.L.P.

TAS:sjm