To accurately control opening and closing of a door, a device includes an opening/closing switch lever arranged at an opening end of a striker receiving groove, and configured to shift between a retreated position and an advanced position. When a striker is positioned in an engagement groove of a latch, the opening/closing switch lever is positioned at the retreated position, and when the striker is removed from the engagement groove and then from a receiving groove, the opening/closing switch lever is positioned at the advanced position. The device further includes an opening/closing switch that performs a switching operation when the opening/closing switch lever that has been positioned at the advanced position shifts toward the retreated position.