Opening and closing apparatus with lock

An opening and closing apparatus with a lock for opening and closing a sliding door that is installed at an entrance of a vehicle and is provided with an elastic member at its door leading end, the opening and closing apparatus with a lock comprising:

• an actuator;
• a moving mechanism for moving the sliding door in a predetermined opening direction and closing direction, using output of the actuator;
• a lock mechanism that is moved to a locking position by output of the actuator so that the lock mechanism at the locking position restricts movement of the sliding door in the opening direction when the sliding door is at a fully closed position;
• and
• a control unit for controlling the actuator, wherein
• the control unit controls the actuator such that a closing operation is performed, the closing operation serving as an operation of operating the moving mechanism so as to move the sliding door along the closing direction to the fully closed position and, at a predetermined intermediate time point during the closing operation, changes the output of the actuator from a predetermined first driving force to a second driving force which is lower than the first driving force, and
• the lock mechanism is moved to the locking position by the actuator once the control unit determines a value of the second driving force.