PROBLEM TO BE SOLVED: To provide a combine harvester which is enabled to avoid reduction in the detection accuracy of a grain weight by causing the weight of a grain tank to act stably when the grain tank weight is detected by using a load cell.SOLUTION: A combine harvester is constituted such that flat portions 71 and 83 are formed at the individual opposite portions of supporting legs 80 formed at the lower portion of a grain tank 5 and a guide member 70 so disposed at a body frame 1 as to guide the supporting legs 80 to the upper side of a pressure receiving face 63A of a load cell 60, so that the weight of the grain tank 5 at the working posture position acts on the load cell 60 while the flat portions 71 and 83 of the supporting legs 80 and the guide member 70.
