The present invention provides a method for manufacturing a film catalyst, including forming a catalyst layer on one side or each side of a base material to obtain a film catalyst, bending the film catalyst, and optionally cutting the film catalyst, wherein the bending step is conducted by bending the film catalyst with a bending tool composed of two gears that are oppositely arranged as meshing each other while a protective material having a compressibility of 40 to 95% is inserted between the catalyst layer of the film catalyst and the two gears.