To provide a method for collecting a support, in a state where it can be reused as a raw material of the support for a photosensitive material from the photographic sensitive material forming an application film, using a natural high polymer based binder and a composite high polymer-based binder for the support.

In the method for collecting the polyester-based resin support for collecting the polyester based resin support, after exfoliating the application film from the polyester-based resin support by treating the photosensitive material using the polyester based resin support with an alkali treatment liquid by using a drum mixer, the drum mixer has a first blade arranged in a drum inner wall in the drum's inside, and a second blade which is independently rotatable in the inside of the first blade.