To provide a simple technology for preventing a failure when winding out a film.

This winding core 10 for winding the film includes a winding core body 12, and a plurality of film supports 14. The winding core body 12 has a cylindrical shape. The plurality of film supports 14 are provided around the winding core body 12 and individually protrude from an outer peripheral surface 12p of the winding core body 12 in a plurality of positions along the circumferential direction of the winding core body 12, respectively, so as to support the film 18 at positions separated from the outer peripheral surface 12p of the winding core body 12. Each of the film supports is constituted of a material which is deformable when the film 18 is wound around the winding core 10.