This temporary fixing double-sided adhesive tape is provided with: a base material; a first adhesive compound layer that adheres to a pedestal; and a second adhesive compound layer that adheres to a workpiece. The first adhesive compound layer includes a first pressure sensitive adhesive compound, a first side chain crystalline polymer, and a foaming agent. The second adhesive compound layer includes a second pressure sensitive adhesive compound and a second side chain crystalline polymer. This temporary fixing method for a workpiece is provided with a step for heating the temporary fixing double-sided adhesive tape to a prescribed temperature and peeling the workpiece along with the temporary fixing double-sided adhesive tape from the pedestal and a step for heating the temporary fixing double-sided adhesive tape to a prescribed temperature and peeling the workpiece from the temporary fixing double-sided adhesive tape.