Combine harvester

The utility model provides a combine harvester which can increase the capacity of a fuel tank under the condition that the shapes and the configurations of a threshing device and a grain tank are not changed. The combine harvester is provided with: a threshing device (4) for threshing harvested crops; a grain tank (5) provided in a left-right lateral alignment state with the threshing device, the grain tank (5) storing the grains obtained by the threshing device; the fuel tank (10) is arranged in a space between the threshing device and the grain tank, a lower narrowing part (5U) which is narrowed downwards in the left-right direction of the machine body is arranged at the lower part of the grain tank, and the fuel tank (10) is provided with a first part and a second part, the first part is arranged in the space in a state of entering a lower space (5S) below the lower narrowing part; and a second portion provided behind the first portion and protruding rearward from a rear end portion of the grain tank, the