PURPOSE: To house a bar-like battery without making a device large by arranging plural bar-like batteries in a specified state and providing a battery falling preventing member.

CONSTITUTION: A mount 2 fixed with a bayonet in a camera main body is fixed by a screw 1a in a fixed barrel 1. The cylindrical bar-like batteries 17 being power sources for a focusing driving motor 7, an electromagnetic diaphragm unit 13 and a control circuit packaged on a main packaging substrate 15 are disposed and housed at specified positions in a battery case 16 functioning as a battery housing part fixed by a screw in a guiding barrel 3. Two bar-like batteries 17 are disposed to be a V shape where an optical path is interposed so that the center axis of a cylinder may be in a direction perpendicular to the optical axis. By moving in the center axis direction of the battery, the battery 17 is attached/detached, and a battery hole 1c which does not prevent the movement of two batteries 17 when they are attached/detached is formed in the fixed barrel 1. Furthermore, a battery cover 18 is provided in order to prevent the falling of the battery 17.