to step s 23 for operating the electric releasing actuator 8 therefore the electric motors 81 91 are not driven and the vehicle door 1 is not operated for the opening operation therefore the vehicle door 1 is not undesirably moved in the opening direction for opening the opening 21 thereby assuring vehicle security after step s 25 the program proceeds to step s 26 at which the cpu 71 judges whether or not the half latch switch 42 is on if the judgment in step s 26 is yes the cpu 71 judges that the latch mechanisms 3 4 are under the unlatched condition in this case the program proceeds to step s 27 for judging whether or not the estimated position of the vehicle door 1 based upon the signal from the position sensor 92 is at a predetermined door opening position p 1 if the determination in step s 27 is yes the cpu 71 judges that the vehicle door 1 is positioned at a position in which the latch mechanisms 3 4 are not operated for returning the vehicle door 1 to the door closed condition in this case step s 27 is followed by step s 28 for terminating the driving operation of the electric motor 81 at step s 29 the cpu 71 judges whether or not the estimated position of the vehicle door 1 based upon the signal from the position sensor 92 is within the predetermined door.