PROBLEM TO BE SOLVED: To provide a method for manufacturing an interdental cleaning tool capable of preventing a deformation of a core part and effectively preventing the occurrence of faulty shaping of a flexible part for cleaning.SOLUTION: A method includes: a step of, on a base end side of a first shaping space, simultaneously supplying synthetic resin materials in which a blending ratio of a fiber is set to be 20 wt.% or more but 35 wt.% or less, from gates that open toward a plurality of corresponding first shaping spaces, to simultaneously forming a plurality of base material parts so that the base material parts are connected parallely at a connection part； and a step of transferring the formed base material parts to a soft part-forming mold, setting a part of a core base material part of the base material part to a plurality of second shaping spaces of the mold, and then forming a soft part so that a plurality of soft part-forming parts for cleaning is filled with an elastomer material from an end side toward the base end side, in a state of holding two or more positions of the core base material part in a lengthwise direction with at least two pairs of holding pins substantially at a center portion of the soft part-forming part for cleaning, wherein each pair of two holding pins are positioned facing each other and protrude into the respective soft part-forming parts to be substantially orthogonal to a matching surface of the mold.SELECTED DRAWING: Figure 11【課題】芯部の変形を防止して、清掃用軟質部の成形不良の発生を効果的に防止し得る歯間清掃具の製造方法を提供する。【解決手段】第１成形空間の基端部側にて、複数の第１成形空間にそれぞれ開口するゲートから繊維の配合割合を２０重量％以上、３５重量％以下に設定した合成樹脂材料を同時に供給し、連結部にて複数の基材部が並列状に連結されるように、該複数の基材部を同時成形し、成形した基材部を軟質部成形金型へ移送し、該基材部のうちの芯基材部の一部を、該金型の複数個の第２成形空間にセットし、該金型の合わせ面と略直交状に各清掃用軟質部成形部内に突出する対向配置した２本１組とする少なくとも２組の保持ピンで芯基材部の長さ方向の２か所以上を清掃用軟質部成形部の略中央部にそれぞれ保持した状態で、複数の清掃用軟質部成形部に対して先端側から基端部側へ向けてエラストマ材料が充填されるように軟質部を成形する。【選択図】図１１
