To provide structure for the camera case of an imaging apparatus which can be attached to the same camera case, by only exchanging a part of structural parts corresponding to the imaging apparatus and various accessories, such as illuminating lamp.

A projection, having a mushroom-shaped cross section, is provided on a side surface of the camera case, and a supporting tool fitting the groove of the projection and having a hat-shaped or U-shaped cross section is fixed by an insert screw or the like. By fixing the imaging apparatus and the accessory on the supporting tool, the supporting tool is easily attached.