again when the cartridge chamber cover depresses the detection switch for a finish of opening again the drive for opening the cartridge chamber cover is finished thereby stopping the pulses if the driving speed of drive for opening closing the cartridge chamber cover 2 or drive for bringing in pushing out the cartridge is to be detected in accordance with generation of pulses the same detection form as shown in fig1 is performed as described above according to the second embodiment of the present invention the following effects can be obtained in addition to the effects of the first embodiment since the camera electrically performs driving for opening closing the cartridge chamber cover or driving for bringing in pushing out the cartridge a trouble during each drive can be rapidly and accurately detected by using the driving speed detecting means as compared to the first embodiment using only the timer in addition since a trouble can be detected in a short period of time the trouble state can be stopped in a short period of time destruction of the internal mechanism of the camera can be further prevented the present invention can also be applied to a camera using a.