To provide an engine cooling device reducing engine component cost and assembling cost by simplifying the construction of a cooling water path from a water pump to a cooling portion of a supply air cooler in an engine having the water pump mounted at the front end to reduce the number of components and assembling manhours for the cooling device.

In the engine having the water pump mounted at the front end, the cooling water path is integrally cast and formed inside a crank case, which is connected to the cooling water outlet of the water pump and connected to the cooling portion while extending to the axial center of the crank.