To provide a camera capable of preventing double exposure and trouble such as the infeasibility of photographing by accurately discriminating the position of an unused frame even in the case of reusing film which has been partially used.

The position of the unused frame of the loaded film F provided with a magnetic storage part, which has been partially used, is decided by a magnetic head H, a magnetic recording/reading-out circuit 21 and a control circuit 20. When reproduced magnetic output is read out, it is changed by using a film feeding driving circuit 23 and the control circuit 20, and whether or not the position of the unused frame is decided is decided by the control circuit 20 based on the variation of the reproduced magnetic output. Furthermore, when the position of the unused frame of the film is not decided, the control circuit 20 inhibits the feeding of the film and inhibits photographing preparation action or photographing action so as to prevent multiple photographing or the infeasibility of photographing from occurring.