To provide a production method of an interdental cleaning implement capable of suppressing leakage of a resin material from a gap between a secondary molding die and a shaft part.SOLUTION: A production method of an interdental cleaning implement comprises a base part preparation step for preparing a base part and a cleaning part formation step for forming a cleaning part, in which a secondary molding die (50) formed in the cleaning part formation step comprises: a holding part (54)； a cleaning part body formation part (56)； a brush part formation part (57)； and a salient part (58) protruded from an inner peripheral face of the holding part (54) so as to encroach to the shaft part (20), in which an end part on the insertion end side of the salient part (58) in the axial direction of the shaft part (20) is connected to an end part on the base end part side of the cleaning part body formation part (56) in the axial direction, and the cleaning part formation step is configured so that in a state in which the holding part (54) holds a part to be held and the salient part (58) encroach to the shaft part (20), a resin material is filled in a filling space (S) from the insertion end (22a) side toward the base end part side.SELECTED DRAWING: Figure 2【課題】２次成形金型と軸部との隙間からの樹脂材料の漏出を抑制可能な歯間清掃具の製造方法を提供すること。【解決手段】歯間清掃具の製造方法であって、基部を準備する基部準備工程と清掃部を形成する清掃部形成工程とを含み、清掃部形成工程で用いられる２次成形金型（５０）は、保持部（５４）と、清掃部本体形成部（５６）と、ブラシ部形成部（５７）と、軸部（２０）に食い込むように保持部（５４）の内周面から突出する凸部（５８）であって、軸部（２０）の軸方向についての凸部（５８）の挿入端部側の端部が軸方向についての清掃部本体形成部（５６）の基端部側の端部とつながっているものと、を有し、清掃部形成工程では、保持部（５４）が被保持部を保持しておりかつ凸部（５８）が軸部（２０）に食い込んでいる状態において、充填空間（Ｓ）に挿入端部（２２ａ）側から基端部側に向かって樹脂材料を充填すること。【選択図】図２
