Abstract: A perforation detection device of a contact piece type to be built into a camera. A detection section of a first contact piece arranged on the rear surface side of a path in which the perforations of a film advance in a film feeding stage is constructed of a metal ball which is a separate member from that of the first contact piece. This metal ball comes in pressure contact with a second contact piece arranged on the front surface side of the film as the perforations pass. When the metal ball faces a perforation of the film, this metal ball comes in contact with both the first and the second contact pieces to provide a continuity between the first and second contact pieces, so that the position of the perforation is detected. In the film feeding stage, the metal ball comes in rolling contact with the film surface. The contact pieces have a very small resistance to the film feed, and it is scarcely possible that the film will be injured.