An operation portion, an annular wall portion 40 having a base portion 40a and a protruding end portion 40b connected to the exterior casing 6k, an operation lever 20 that the operator can tilt and operate, an operation portion 1 covering member 60 having a mounting portion 61, a deforming portion 63 deforming as the operating lever 20 is tilted, and a second mounting portion 62 on which the inner peripheral surface 62 n is mounted on the outer peripheral surface 40 g of the wall portion 40, Has an abutting portion 71 contacting the outer peripheral surface 62 g of the second mounting portion 62, and the abutting portion 71 is deformed so as to press the outer peripheral surface 62 g of the second mounting portion 62, and the elasticity fixed to the exterior casing 6 k And a member 70.操作部と、外装筐体6kに連設された基部40aと突出端部40bとを有する環状の壁部40と、操作者が傾倒操作可能な操作レバー20と、操作レバー20に装着される第1装着部61と、操作レバー20の傾倒に伴って変形する変形部63と、内周面62nが壁部40の外周面40gに装着される第2装着部62とを有するカバー部材60と、第2装着部62の外周面62gに接する当接部71を有し、当接部71が第2装着部62の外周面62gを押圧するように変形されて外装筐体6kに固定された弾性部材70と、を具備する。
