To easily find a defective product with no drop of a setting speed of an exterior resin by comprising an ultraviolet ray setting type resin and a fluorescent brightening agent mixed with it while the mixing amount of the fluorescent brightening agent per ultraviolet setting type resin weight is specified.

An exterior resin composition for a film capacitor is used for a film capacitor manufactured through a process where a plastic film is wound, a lead wire is connected to the obtained capacitor element, the lead wire is coated with a mold release agent, and the exterior resin is dip-coated. The exterior resin composition for the film capacitor mainly comprises an ultraviolet setting type resin (including the combrid type of ultraviolet-ray-setting and heat-setting types) and a fluorescent brightening agent mixed with it. Here, the mixed amount of the fluorescent brightening agent is 0.01-1 pts.wt. per 100 pts.wt. ultraviolet-ray setting type resin.