To prevent a tool from being inserted into a tool insertion path without removing a wheel stopper.

A mechanism 10 for manually releasing an electric parking brake includes a wheel stopper mounting mechanism 17 configured to be mounted with the wheel stopper 16 so as to prevent the tool from inserted into the tool insertion path X into which the tool is inserted so as to release a braking force of an electric parking brake. The wheel stopper mounting mechanism 17 includes a first plate 18 and a second plate 20. The first plate 18 and the second plate 20 lock the wheel stopper 16 above the tool insertion path X so that the wheel stopper 16 is disposed above the tool insertion path X. A caution reminder label 22 on which a sentence urging an operator who takes in charge of an operation of releasing the braking force of the electric parking brake, to use the wheel stopper is stated, is attached to the wheel stopper 16.