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 determination unit (801) determines the angular range of an ACG starter motor (48) as a motor stage on the basis of the direction of the 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 determined on the basis of a combination of the directions of the current flowing through each of the U, V, and W phases. A reverse rotation detection unit (802) detects the rotation direction of the crank shaft (40) shifting from forward rotation to reverse rotation on the basis of the change of the motor stage. An ignition prohibition unit (803) performs engine ignition at a normal ignition timing as long as the engine rotates forward, and prohibits engine ignition when reverse rotation is detected by the rever