Polypyrrole (PPy) actuators, which expand and contract by doping and dedoping ions in an electrolyte solution, have been reported to have a large strain under a large stress. However, many of these actuators exhibited notable electrochemical creep (swelling) after repeated electrochemical actuations. Here, actuator films were prepared by electrochemical polymerization of pyrrole and diethyl 3,4-pyrroledicarboxylate with different mol ratios. The actuating strain of the film actuators prepared from a solution of pyrrole and diethyl 3,4-pyrroledicarboxylate with 97:3 mol ratio showed significant reduction of the electrochemical creep with minimal reduction of the actuating strain.