A smart entry system has an auto lock mode in which an auto lock function to automatically lock at least one door of the vehicle is executed in response to detection that a mobile device has got away from the vehicle, and the smart entry system includes: at least one movable member visually recognizable from outside the vehicle; and a control section that, once the vehicle shifts to the auto lock mode, actuates the at least one movable member to a predetermined state. Examples of the at least one movable member include electric folding door mirrors, vehicle height adjustment devices, electric sun shades, and pop-up door handles.