Disclosed are a sheet material stocking mechanism providing a large stocking capacity with a small space and a printer equipped with such a stocking mechanism. A thermal printer is composed of a roll accommodating unit (2) retaining a heat sensitive adhesive sheet (1) wound into a roll, a printing unit including a printing thermal head (4) for performing printing on the heat sensitive adhesive sheet (1), a cutter unit (3) for cutting the heat sensitive adhesive sheet (1), a stocking unit including a take-up device (10) which takes up the heat sensitive adhesive sheet (1) that has undergone printing in a cylindrical form to stock it temporarily, and a thermal activation unit including a thermal activation thermal head (6) that thermally activates a heat sensitive adhesive agent layer of the heat sensitive adhesive sheet (1).