To provide a manual releasing mechanism capable of facilitating the operation for releasing a braking state as an engaging and connecting state with an opening and shutting body and an opening and shutting machine and the operation for returning to the braking state.

The manual releasing mechanism includes a controlling piece 16 having an energizing means energized to a direction for making the opening and shutting body 3 and the opening and shutting machine 7 as a separated state, a slider 29 connected to the controlling piece 16 through a wire 18 in a slidable manner, a roller 33 put on the slider 29 through a shaft 31, a freely oscillating lever 35 having a link lever 36 connecting one end to the shaft 32, a ratch claw 39 engaging with the roller 33 and holding the controlling piece 16 at one moving position against energizing force through the wire 18 and a push-button 45 releasing a state engaging with the roller 33 by oscillating the ratch claw 39.