To comparatively facilitate design concerning the arrangement and the attachment of a film perforation wheel and to easily realize automatic assembly by placing either side of a sprocket wheel on the supporting surface of a housing part and providing a bearing collar on the other side.

A perforation wheel assembly base 100 is arranged and rotatably attached between the upper wall 17 of the core assembly 2 of the photographing machine and an upper housing wall 18 formed of two housing covers 3 and 4. The tooth of the edge of the film perforation wheel, that is, the sprocket wheel 101 projects in a film feeding path and is meshed with perforation at the edge provided on film. Thus, the wheel is captured and turned in the midst of feeding the film. The bearing collar 103 is placed just above the wheel 101 and acts as the attachment part of the radial direction of the wheel 101.