A drive control circuit supplies power to a solenoid coil in an in-cylinder injector of a cylinder in response to a fuel injection signal. A failure detection circuit to detect disconnection failure at an in-cylinder injector is arranged to be shared among cylinders whose phase of each stroke differs 360 degrees in crank angle. An engine ECU detects failure including identification of the injector with disconnection failure based on a failure detection signal from the failure detection circuit, and a crank angle detected by a crank angle sensor. The driver is notified of the failure detection result through the engine ECU.