An application-film transfer tool includes a supply bobbin around which an unused transfer tape is wound; a transfer head around which the transfer tape is extended, the transfer head pressure-sensitively transferring an application film of the transfer tape onto a transfer subject by pressing against the transfer subject; a take-up bobbin taking up the used transfer tape; a clutch mechanism transmitting the rotation of the supply bobbin to the take-up bobbin and controlling the rotational speed of the take-up bobbin; and a reverse-rotation prevention mechanism preventing reverse rotation of the supply bobbin, wherein part of the supply bobbin constitutes part of the reverse-rotation prevention mechanism.