To provide a lens case for preventing an adherent which blocks the visual field of a lens.

A lens case (10) includes: a cylindrical casing (20); a lens installation site (22) provided on the inner surface of the casing (20); a flange (24) provided at one end of the casing (20); and an opening (20p) provided at a position between the lens installation site (22) of the casing (20) and the flange. The flange (24) has a body part (24s) and a cutout part (24p) provided on the body part (24s).