1. A supercharged engine including a supercharger, disposed rearwardly of a cylinder assembly of an engine, for supplying supercharging air into a combustion chamber of said engine, a drive pulley mounted on a supercharger drive shaft of said engine, a driven pulley mounted on an input shaft of said supercharger, a drive belt trained around said drive pulley and said driven pulley, a liquid-cooled intercooler for cooling supercharging air that is supplied from said supercharger, and a coolant pump for delivering a coolant under pressure to said intercooler, said supercharged engine comprising: a belt tensioner for tensioning said drive belt; said coolant pump including an electrically operated coolant pump actuatable by an electric motor and disposed on a crankcase positioned more closely to a center of the engine across a width thereof in directions along a crankshaft of the engine than said belt tensioner.