Abstract: A single-use camera which includes: a film winding knob, capable of rotating in the winding direction, for winding a film so as to feed the film frame by frame; a reversion-preventing member, having an engagement with the film winding knob, for preventing the film winding knob from rotating in the opposite direction to the winding direction; a releasing member for releasing the engagement of the reversion-preventing member with the film winding knob when the film is wound by the film winding knob so that the noise, generated from the reversion-preventing member, is prevented.

Abstract: In a lens holding device, a plurality of protrusions of equal height are provided oppositely at the front and rear of the periphery of a plastic photographic lens. The plurality of protrusions are substantially equidistant. Three sets of stairs, each having a plurality of steps with a predetermined difference in height between adjacent steps, are provided at positions corresponding to the protrusions in a lens receiving member and a lens pressing member, between which the lens is sandwiched. The position of the lens can be adjusted from a most advanced position to a most retreated position along the optical axis by selecting a preferred step of each of the stairs.