A camera comprising a camera sheath composed of a front cover unit and a rear cover unit, a camera body supported in the camera sheath, and positioning mechanism for positioning the camera body with respect to the camera sheath without fixing them. The positioning mechanism is composed of a pair of protrusions protruding from the front cover unit and a pair of hole portions formed in a reinforcing plate unit of the camera body and capable of being fitted individually on the protrusions. A gap of about 1 mm or less is formed in the whole area between the camera body and the camera sheath except fitting portions including the positioning mechanism.