To provide a body of a cartridge adaptable to small-lot production without increasing a complicated step or material, and to provide a steel plate material for a body of a cartridge, and a method for manufacturing a body of a cartridge and a system for manufacturing a body of a cartridge using the steel plate material for a body.

The body of the photographic film cartridge has a CAS code and a bar code, wherein at least a portion on which the bar code is located is configured by sequentially layering a coating film whose lightness of the Munsell color system is 0-3 and a coating film whose lightness is 4-10, and the bar code is formed by removing the coating film whose lightness is 4-10.