A combine in which a side panel where operation levers are arranged is installed ON a side column installed ON the left side of a seat. A side wall part is formed ON the upper surface of the side column and ON the left and front sides relative to the direction of travel of the combine. A recess and recessed in side and front views, is formed in the side wall part and at the middle in the front-rear direction. The operation levers are distinguished by using different colors into the levers for a traveling system and the levers for a working system. Members are distinguished by using different colors according to procedures of maintenance operation. The operation levers for a traveling and transmission system and the operation levers for a working and operation system are distinguished by colors. The operation levers for the traveling and transmission system are colored orange and those for the working and operation system are colored in yellow. As a result, a user can visually recognize the operation levers by intuition. Maintenance members are also distinguished by colors for improved maintainability.
