To provide a device for opening and closing a cartridge chamber cover which enables prevention, etc., of damage of parts of a camera body caused by the excessive pressing of the cartridge chamber cover by a user by enabling the detection of both of the opening and closing state of a cartridge chamber and the locking state of a closed lid locking means, accurately controlling the closed cover locking means and forming the cartridge chamber with good operability, and to provide a method for lock-controlling the cartridge chamber cover, and a storage medium.

The camera is provided with a cartridge chamber cover 2 to cover the loading slot of the cartridge chamber for housing a cartridge, a lock gear 51 to lock the cartridge chamber cover 2 in a closed state, an cover opening/closing detecting switch 61 to detect the opening and closing state of the cartridge chamber cover 2, a locking state detecting switch 62 to detect the locking state of the lock gear 51, and a microcomputer to control the operation of the lock gear 51 on the basis of the detection states of the lid opening/ closing detecting switch 61 and the locking detecting switch 62.