To provide a wide-use operation panel which is simple in structure and which can be used in various facility machines and which eliminates a need of making installation holes for switches, etc., and which can easily cope with any change in design, etc.

An opening 2a of a box member 2 can be closed with a door member 3 which has an opening 3a in a front face. On a rear face of the periphery of the opening 3a of the door member 3, a supporting member 10 which has a plurality of supporting holes formed at specified pitches is installed. Then, a mail 6 is laid across the supporting member 10 and then is fastened using the supporting holes. The mall 6 is located in the up and down direction and a back face of the box member can be reinforced by the mall 6. Then, a plurality of panel members which have nearly the same width as that of the opening 3a of the door member 3 are so located as to cover the opening 3a of the door member 3.