To make easier and more accurate assembly work possible when manufacturing transfer tools, this transfer tool has a configuration wherein the casing is equipped with: a first case inside which a transfer tape can be fitted; a second case that, by closing off the interior of the first case, can assume a use position in which the second case together with the first case holds the transfer tape so as to be usable; and a snap hinge that is provided between the two cases and comprises a hinge body, which rotatably connects the two cases, and elastic deformation sections, which are provided near the hinge body so as to allow elastic deformation and which bias the second case to the use position or a position near the use position when the second case is closer to the use position than a given change point and bias the second case to the open position when the second case is further from the use position than the change point.