A compact shift lock unit is provided having a detecting switch and a solenoid operated stopper driver that drives a stopper that engages with and separates from a shift lock plate. When the detecting switch detects a P position, power input connector pins of the stopper driver are positioned in a row with signal output connector pins of the detecting switch. The signal output connector pins and the power input connector pins are interconnected by a single female-type connector at wiring between the stopper driver as well as the detecting switch. A shift lock controller operates and controls the stopper driver so that the stopper separates from the shift lock plate and allows it to move due to the movement of a grooved pin when a shift lever is in a P position and a brake pedal is depressed.