CANISTER

A canister includes a canister casing comprised of a tubular casing body and a cover. The casing body has an open end and a closed end. The cover is attached to the casing body to close the open end of the casing body. The cover includes a support plate portion, a joint portion to be joint to the open end of the casing body, and a tubular connecting portion that connects the support plate portion to the joint portion. The connecting portion is capable of being cut in a direction perpendicular to an axis of the connecting portion. An identification portion indicating a cutting region is provided on an outer peripheral surface of the casing body such that the cutting region is located within a range that overlaps with the connecting portion in an axial direction of the casing body.