To provide a sheet for medical bags which is easily handled, assembled by simple operation, provided with an openable lid for opening/closing a bag body, and surely holding a medicine therein.

The sheet for medical bags is provided with a peripheral adhesive layer 8 for bonding the peripheral edges of a front surface base material 4 and rear surface base material 5 to each other, a re-peelable adhesive layer 6 bonded to the front surface base material 4, and a release paper 7 temporarily bonded to the re-peelable adhesive layer 6 and bonded to the perimeter adhesive layer 8 are laminated; and the end parts of the release paper 7, perimeter adhesive layer 8 and rear surface base material 5 are removed so that a medicine storing space section 12 is opened at the portion of a perforated line 13 to form the bag body 2A and an opening/closing cover section 2B. The portions of the front surface base material 4 and the re-peelable adhesive layer 6 positioned at the outward side from the perforated line 13 are made to function as the opening/closing cover section 2B which can be bent toward the portion of the rear surface base material 5 in the bag body 2A.