An opening/closing controlling apparatus of the present invention has an automatic opening/closing mechanism for automatically opening and closing an opening/closing object such as a door; a collision detecting sensor for detecting a collision of a vehicle; a time measuring device for measuring a time from a time when the collision detecting sensor detects a collision of the vehicle; and an opening/closing controller for prohibiting automatic opening/closing of the opening/closing object from the time of the collision of the vehicle and for permitting the automatic opening/closing by the automatic opening/closing mechanism after passage of a predetermined time since the collision. The present invention successfully achieves high reliability in the event of a vehicle accident.