To prevent a lens-fitted photographic film from illegally being reused.

An electronic flash control IC26 is mounted on a circuit board 17 of an electronic flash unit 15. The electronic flash control IC26 has a magnetic memory 31 inside. The magnetic memory 31 is magnetized in response to input of an operation inhibition signal of an electronic flash circuit. The magnetic memory 31 is thus magnetized to inhibit the electronic flash circuit from operating. The magnetic memory 31 is demagnetized to release the electronic flash circuit from the operation inhibited state.