To provide a spacer sheet which is more reliably stuck to the inner surface of a hollow cylindrical body and can maintain the stuck state over a prolonged period of time.

A plurality of linear grooves 10a are formed on a spacer sheet 10. When this spacer sheet 10 is stuck to the inner surface 12b of a winding core 12 which is a hollow cylindrical body applied to a light-shielding photosensitive material roll 14, the linear grooves 10a are oriented to a direction perpendicular to the circumferential direction of the inner surface 12b.