Engine cooling structure
To provide an engine cooling structure, capable of restricting projection quantity of a cylinder head side surface to improve the degree of layout freedom around a cylinder head without causing complicatedness of piping structure, while achieving reduction of assemblage processes. A water pump 601 and a thermostat 631 to feed cooling water to water jackets 171 and 172 of an engine E under pressure are provided on a cover member 641 installed on the outer side of a crankcase 3 of the engine E. On the cover member 641, a cooling water passage 651 is integrally formed from the thermostat 631 through the water pump 601 to be communicated with the water jackets 171 and 172. Layout of this engine cooling structure 600 with favorable space efficiency is thus provided.