OPERATION APPARATUS

A unit chassis of an operation unit is fixed by a fixing screw to a coupling support portion provided at a support member. A front contact portion is formed at a fixing piece provided at the coupling support portion, and a front restriction portion formed at a right plate portion of the support member and the front contact portion face each other to be spaced apart by a distance in the front-rear direction (Z1-Z2 direction). When the operation unit is pulled toward the near side (Z1 direction), the front contact portion comes into contact with the front restriction portion and restricts a movement of the operation unit.