Abstract: A photographing number change-over device is effectively used for a four lens camera capable of simultaneously photographing four pictures on a film. The device comprises a first sector for shutting off two photographing lenses symmetrically opposed with respect to a center axis of the film, a second for shutting off either one of two remaining photographing lenses, and a driving member rotatively driven in increments of 90.degree. by a motor through a reduction gear, a cam, a reciprocal moving member, a bell crank lever and an engaging pawl for driving the first and second sectors to positions where all the photographing lenses are not shut off.