This combine harvester is provided with: a grain conveyance mechanism for conveying grain from a threshing device to a grain tank； a grain release device that is provided to the end edge of the grain conveyance mechanism and that comprises a release case which is provided with a grain release port and a release rotary body which is rotatably disposed in the release case； a pressing action part that receives pressing force from the grain before grain release by the discharge rotary body； a load detector that detects the pressing force acting on the pressing action part； and a yield evaluation unit that evaluates the grain conveyance amount from the detection signal from the load detector.
