POWER OF ATTORNEY
      The undersigned, as a Section 16 reporting person of Box, Inc. (the
"Company"), hereby constitutes and appoints Jeff Mannie, Dylan Smith and David
Leeb, and each of them, as the undersigned's true and lawful attorney-in-fact
to:
1.	complete and execute Forms 3, 4 and 5 and other forms and all amendments
thereto as such attorneys-in-fact shall in their discretion determine to be
required or advisable pursuant to Section 16 of the Securities Exchange Act of
1934 (as amended) and the rules and regulations promulgated thereunder, or any
successor laws and regulations, as a consequence of the undersigned's ownership,
acquisition or disposition of securities of the Company; and
2.	do all acts necessary in order to file such forms with the Securities and
Exchange Commission, any securities exchange or national association, the
Company and such other person or agency as the attorneys-in-fact shall deem
appropriate.
      The undersigned hereby ratifies and confirms all that said
attorneys-in-fact and agent shall do or cause to be done by virtue hereof.  The
undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934 (as amended).
       This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
Company and the foregoing attorneys-in-fact.
      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 11 day of May, 2019.
Signature: Peter Leav