To provide an envelope with a picture frame function which is used for a picture frame after the envelope is served for mail or the like.

The rectangular envelope 1 having a face sheet 2 and a back sheet 3 overlapping each other comprises (a) size-reducing perforations 10 and 18 which are formed continuous to the face sheet 2 and the back sheet 3 and capable of cutting and removing one short side 6, (b) an opening perforation 9 which is formed in the face sheet 2 and capable of opening a center portion, (c) a transparent film 4 affixed to an area other than the center portion to be opened in the back side of the face sheet 2 by the opening perforation 9, and (d) a stand perforation 19 which is formed in the back sheet 3 and capable of forming a stand piece 26.