Provided is a combine harvester which has required capacity in a grain storage part and is small in horizontal width and stable in performance. in order to reach the aim, the combine harvester has a travel body with a pair of left and right track travel devices (1, 1), a running part arranged on one end side of a left direction and a right direction at a front end of the travel body, a harvest pretreatment device (3) swingly and freely connected on the other end side of the left direction and the right direction of the travel body, a threshing device (4) arranged on the harvest pretreatment device (3) along the left direction and the right direction and a grain storage part (5). The interval (D2) between a left center and a right center (21C) of a grounding wheel (21) of the track traveldevice (1) and a horizontal outside end (5a) of the grain storage part (5) near one side of the grain storage part (5) is set smaller than that (D1) between the grounding wheel (21) of the track travel device (1) near one side of the threshing device (4) and a horizontal outside end (4b) of the threshing device (4).