PROBLEM TO BE SOLVED: To enable a push-button-type switch to be subjected to a pushing operation in an alternative way without causing the misoperation of an operator when installing a plurality of the push button-type switches enabling the pushing operation to be carried out with the thumb of the operator in a state of gripping a steering operation tool which is turnably operated by the operator while being gripped by the hand, in the upper part of the steering operation tool.SOLUTION: The combine harvester is constituted as follows. Both of the push button-type switches 31a and 31b are arranged in an upward slant to the right based on the horizontal direction H when installing the right and left pair of the push button-type switches 31a and 31b enabling the pushing operation by the thumb in the upper part of the steering operation tool 7, and a facing upper and lower pair of the push button-type switches 32a and 32b enabling the pushing operation by the thumb is arranged in a left slant based on the vertical direction V at the nearly intermediate position m of both the push button-type switches 31a and 31b.COPYRIGHT: (C)2010,JPO&INPIT【課題】オペレータが手で握りながら揺動操作する操向操作具の上部に、オペレータが操向操作具を握った状態の親指で押圧操作可能な複数の押しボタン式スイッチを設けるにあたり、オペレータが誤操作を起こすことなく択一的に押しボタン式スイッチを押圧操作できるようにする。【解決手段】操向操作具7の上部に親指で押圧操作可能な左右一対の押しボタン式スイッチ31a,31bを設けるにあたり、両押しボタン式スイッチ31a,31bを水平方向Hに対して右上がり傾斜で配置すると共に、両押しボタン式スイッチ31a,31bの略中間位置mにおいて、親指で押圧操作可能な対向する上下一対の押しボタン式スイッチ32a,32bを垂直方向Vに対して左傾斜で配置した。【選択図】図6
