SUMMARY OF THE INVENTION An object of the present invention is to provide a turning transmission apparatus in which no coupling occurs in a half-clutch state at the time of turning. The first frictional plate 74a or the second frictional plate 74b is provided on the slide member 73 so as to be able to press the movable frictional member 74a along the support shaft 71 and a member on the side of the transmission case MC A wet multi-plate clutch 74 configured to urge the first friction plate 74a and the second friction plate 74b from both sides, and a stationary pressing portion 74d opposed to the movement urging portion 77 press the support shaft 71 The first friction plate 74a and the second friction plate 74b are elastically deformable by compression, and are elastically deformable in the circumferential phase around the support shaft 71, The pressing force applied by both the movement urging portion 77 and the stop urging portion 74d is applied to the first friction plate 74a and the second friction plate 74b through the elastic member 31, And acts on at least one of the friction plates 74b. SUMMARY OF THE INVENTION The object of the present invention is to provide a headlamp in a state in which a headlamp can be easily maintained in a preliminary part and to make it easy to avoid catching of the standing grain bed or the uncracked grain bed to the headlamp, It is to enable solid support. A light-receiving recess 41 '', which is open in all directions and transversely outward directions of the traveling base, is disposed on the transverse cover 40'' of the pre-installation part at a position above and rear of the nozzle. The frame side support body portion 42b ''disposed on the side of the side plate portion 40a'' of the transverse cover 40 ''and the side plate portion 40a'' on the side of the frame side support body portion 42b '' Side supporting body portion 42a ''which is fastened and connected to the lighting-lamp supporting member 42'' and which is disposed i
