To provide an envelope set capable of easily preventing leakage of personal information.

The envelope set 1 comprises: an envelope 2 having a window 23 formed of a transparent film; a sheet material 3 inserted into the envelope 2; and an address display sheet 4 attached to the sheet material 3 inserted into the envelope body 2 at the position corresponding to the window 23. A releasing processed part whereon releasing processing is performed is formed at the position to attach the address display sheet 4 to on the sheet material 3. An adhesive layer 41 is formed on one face of the address display sheet 4 on the sheet material 3 side, and the address display sheet 4 is releasably attached to the releasing processed part via the adhesive layer 41.