The standard combine of the invention of this application comprises: a traveling machine body (1) having mounted thereon an engine (7) as the power source a harvesting device (3) having harvesting blades (15) and a threshing device (9) having a handling drum (21). The engine (7) is disposed on the traveling machine body (1) at a position at one side of the rear part of the threshing device (9), and a radiator (172) which water-cools the engine and a cooling fan (170) which air-cools the engine (7) and the radiator (172) are disposed in front of the engine (7). A cooling air duct for the engine (7) is formed by a cover duct body (173) covering a region which extends from the other side of the threshing device (9) from the engine (7) to a position in front of both the radiator (172) and the cooling fan (170).
