In the manufacture of the interdental cleaning tool, a plurality of first molding spaces composed of a core base material part molding part and a handle base material part molding part are provided in parallel in the first mold for molding the base material part and adjacent to each other. A connecting portion forming portion that communicates with the handle base portion forming portion is provided, and the base portion is formed by simultaneously supplying the synthetic resin material added with the fiber material from the gate to the plurality of first forming spaces. The base material portion is transferred to a second mold for molding the cleaning soft portion, and the base material portion is held by a plurality of sets of holding pins, one set of which is provided on the second die. On the other hand, filling the elastomer material into the cleaning soft part forming part to form the cleaning soft part effectively prevents deformation of the core part and molding failure in the cleaning soft part.歯間清掃具の製造において、基材部を成形する第１金型に、芯基材部成形部とハンドル基材部成形部とからなる第１成形空間を複数並列状に設けるとともに、隣接するハンドル基材部成形部を連通する連結部成形部を設け、上記複数の第１成形空間に対してゲートから繊維材を添加した合成樹脂材料を同時に供給して基材部を成形し、次に、清掃用軟質部を成形する第２金型に該基材部を移送し、該第２金型に設けられた２本を１組とする複数組の保持ピンによって上記基材部を保持しつつ、清掃用軟質部成形部に対してエラストマ材料を充填して清掃用軟質部を成形することにより、芯部の変形や清掃用軟質部における成形不良を効果的に防止する。
