Abstract: A mounting structure of a resin part on a chassis includes a leg portion of the resin part, and a mounting part in the chassis to mount the leg portion thereon by tightening the leg portion with a screw. Preferably, the mounting part includes an upper piece in a horizontal direction which is cut and erected upwardly and both side pieces of which are integral with the chassis and inclined downwardly in an outward direction, the leg portion includes a blind hole, the upper piece includes a screw hole vertically passing through, the resin part is mounted on the chassis by inserting the leg portion horizontally into an opening below the upper piece and screwing the screw into the screw hole, and a lower end of the screw comes into contact with a bottom of the blind hole and does not protrude to a back face side of the chassis.