Automatic locking apparatus

Abstract

An automatic locking apparatus which is installed in a vehicle, communicates with a portable-unit in areas inside/outside the vehicle, and automatically locks doors, based on whether a response-signal is received from the portable-unit and opening/closing of the doors. The apparatus includes a door-opening/closing-detecting-unit, an inside-of-vehicle-determining-unit forming a communication-area inside the vehicle when one door changes from the opened-state to the closed-state, and determining whether the response-signal is received, an outside-of-vehicle-determining-unit forming a communication-area outside the vehicle when the response-signal is not received, and determining whether the response-signal is received, a locking-control-unit automatically locking the doors when the response-signal is received, when all the doors are closed and presence-of-reception is changed to absence-of-reception, and a storing-unit storing history-information indicating that the response-signal is received. When the response-signal is not received, and the storing-unit stores history-information, the locking-control-unit automatically locks the doors when all the doors are closed and reception is absent.