Power of Attorney

	I, William D. Gutermuth, a director of Main Street Capital Corporation (the
"Company"), hereby authorize and designate each of Vincent D. Foster, Todd A.
Reppert, and Rodger A. Stout as my agent and attorney-in-fact, with full power
of substitution, to:

	(1)  prepare and sign on my behalf any Form 3, Form 4 or Form 5 under Section
16 of the Securities Exchange Act of 1934, and file the same with the Securities
and Exchange Commission and each stock exchange on which the Company's
securities are listed;

	(2)  do and perform any and all acts for and on my behalf which may be
necessary or desirable to complete and execute any such Form 3, Form 4, or Form
5, under Section 16 of the Securities Exchange Act of 1934 and timely file such
form with the Securities and Exchange Commission and any stock exchange or
similar authority; and

	(2)  take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to
me, in my best interest, or legally required by me, it being understood that the
documents executed by such attorney-in-fact on my behalf pursuant to this Power
of Attorney shall be in such form and shall contain such terms and conditions as
such attorney-in-fact may approve in such attorney-in-fact's discretion.

	I hereby grant to each such attorney-in-fact full power and authority to do and
perform any and every act and thing whatsoever requisite, necessary or proper to
be done in the exercise of any of the rights and powers herein granted, as fully
to all intents and purposes as I might or could do if personally present, with
full power of substitution or revocation, hereby ratifying and confirming all
that such attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this Power of
Attorney and the rights and powers herein granted.  I acknowledge that the
foregoing attorneys-in-fact, in serving in such capacity at my request, are not
assuming, nor is the Company assuming, any of my responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

	This Power of Attorney shall remain in effect until I am no longer required to
file Forms 3, 4 and 5 with respect to my holdings of and transactions in
securities issued by the Company, unless earlier revoked by me in a signed
writing delivered to the foregoing attorneys-in-fact.


Dated: 10/11/07					Signed: /s/ William Gutermuth