ENGINE STARTER DEVICE FOR VEHICLES

Provided is an engine starter device for vehicles that is capable of preventing kickback with a simple structure without providing a dedicated sensor for detecting the rotational speed of a crankshaft.A motor stage identification unit (801) identifies an angular range of an ACG starter motor (48) as a motor stage on the basis of the direction of a current flowing through each phase of the ACG starter motor (48). If a three-phase AC motor is adopted as the ACG starter motor (48), the motor stage is identified on the basis of a combination of the directions of the current flowing through each of U, V, and W phases. A reverse rotation detection unit (802) detects that the rotational direction of the crankshaft (40) is changed from forward rotation to reverse rotation on the basis of a change in the motor stage. An ignition prohibition unit (803) ignites the engine at a normal ignition timing as long as the engine rotates forward, and prohibits ignition of the engine when reverse rotation is detected by the reverse rotation detection unit (802).