A surgical device retracting mechanism comprising: a holder for holding a surgical device; a guiding member for guiding the holder to linearly advance and retract; a locking member for locking the holder in a state in which the surgical device is inserted in a surgical site; and a retracting unit for releasing a locking state of the locking member and retracting the holder in accordance with a signal from outside the retracting unit , wherein the retracting unit includes: a first force generating member for generating a first force (F1) in a retracting direction of the holder in a state in which the holder is locked; a second force generating member for generating a second force (F2) for releasing the locking state of the locking member; and a third force generating member for maintaining the locking state of the locking member against the second force (F2) characterized in that the locking member is a turnable member that is turnable about a fulcrum , and the turnable member has a first end coming in contact with the holder and a second end on which the third force (F3) acts in the locking state the third force generating member is a solenoid for actuating the second end of the turnable member while power supply to the solenoid is on a holder for holding a surgical device; a guiding member for guiding the holder to linearly advance and retract; a locking member for locking the holder in a state in which the surgical device is inserted in a surgical site; and a retracting unit for releasing a locking state of the locking member and retracting the holder in accordance with a signal from outside the retracting unit , wherein the retracting unit includes: a first force generating member for generating a first force (F1) in a retracting direction of the holder in a state in which the holder is locked; a second force generating member for generating a second force (F2) for releasing the locking state of the locking member; and a third force generating member for maintaining the locking state of the locking member against the second force (F2) characterized in that the locking member is a turnable member that is turnable about a fulcrum , and the turnable member has a first end coming in contact with the holder and a second end on which the third force (F3) acts in the locking state the third force generating member is a solenoid for actuating the second end of the turnable member while power supply to the solenoid is on a first force generating member for generating a first force (F1) in a retracting direction of the holder in a state in which the holder is locked; a second force generating member for generating a second force (F2) for releasing the locking state of the locking member; and a third force generating member for maintaining the locking state of the locking member against the second force (F2) characterized in that the locking member is a turnable member that is turnable about a fulcrum , and the turnable member has a first end coming in contact with the holder and a second end on which the third force (F3) acts in the locking state the third force generating member is a solenoid for actuating the second end of the turnable member while power supply to the solenoid is on <EOS>