position where the half latch engagement is attained to a full latch position where the full latch engagement is attained a wire cable 6 is laid between the powered closing unit 3 and the latch unit 1 for transmitting a power from the powered closing unit 3 to the latch unit 1 and accordingly the latch 4 of the latch unit 1 can be turned toward the full latch position under the power of the powered closing unit 3 the powered closing unit 3 comprises a base plate 17 secured to the sliding door 43 and a motor 13 attached to the base plate 17 a gear part 19 of a sector gear 18 is meshed with an output gear 21 of the motor 13 the sector gear 18 is journalled to the base plate 17 through the intermediary of a shaft 20 a winch lever 22 is rotatably journalled to the shaft 20 and is engaged thereto with one end 65 of the wire cable 6 a connecting lever 23 is provided between the winch lever 22 and the sector gear 18 as shown in fig5 the connecting lever 23 is formed therein with an elongated hole 24 through which the shaft 20 pierces the connecting lever 23 is slidable by a distance equivalent to a length of a play obtained between the elongated hole 24 and the shaft 20 the connecting lever 23 is provided at one end thereof with a pin 25 see fig5 which is projected from the opposite.