ENGINE SYSTEM

Provided is an engine system capable of immediately restarting an engine upon detecting a driver's reaccelerating operation while an engine speed is decreased by idle-stop control. In an engine system (1) including an idle-stop control unit (26) which performs the idle-stop control of stopping a fuel injection to an engine (2) when the engine (2) idly rotates upon stopping the vehicle by connecting an electric assist turbocharger (4) obtained by the combination of a turbocharger and a motor (3) to an intake and exhaust system of the engine (2), the idle-stop control unit (26) is configured to restart the engine (2) by resuming the fuel injection to the engine (2) while operating a motor (3) upon detecting the reaccelerating operation during the idle-stop control.