PROBLEM TO BE SOLVED: To effectively prevent break of a cleaning part when inserting an interdental cleaner between teeth or cleaning between the teeth.SOLUTION: An interdental cleaner 1 includes: a base material part 10 that has a handle base material part 11 and an elongated shaft-like core material part 12 and that is composed of a resin composition and a soft part 20 that has a cleaning soft part 21 including a cover part 21a for covering the core base material part 12 and a protrusion 21b molded integrally with the cover part 21a and that is composed of elastomer, where the core base material 12 and the cleaning soft part 21 constitutes a cleaning part 2 for interdental cleaning. The length of the cleaning soft part 21 is 10-18 mm, and a diameter of a portion of 1-6 mm from the tip end to the base end is within the range of 0.6-1.3 mm. In a state where the cleaning soft cleaning 21 is fixed horizontally, with the tip end thereof defined as a free end, when a 20g load is vertically downward applied to a position of 2.5 mm from the tip end to the base end, a displacement amount of the cleaning soft part 21 is 6.5 mm or more. Further, the resin composition constituting the base material part 10 includes a synthetic resin and a plate-like filler.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】歯間挿入時及び歯間清掃時に、清掃部の折れを効果的に防止する。【解決手段】ハンドル基材部11及び細長い軸状の芯基材部12を有し、樹脂組成物からなる基材部10と、芯基材部12を被覆する被覆部21a及び被覆部20aに一体的に成形した突起部21bを含む清掃用軟質部21を有し、エラストマからなる軟質部20を備え、芯基材部12と清掃用軟質部21とで歯間清掃用の清掃部2を構成し、清掃用軟質部21の長さが10~18mm、先端から基端側へ1~6mmまでの径が0.6~1.3mmの範囲であり、清掃用軟質部21の先端が遊離端となるように水平方向に固定した状態で、前記先端から基端側へ2.5mmの位置に鉛直方向下方に20gの荷重を掛けた時の清掃用軟質部21の変位量が6.5mm以上であり、かつ基材部10を構成する樹脂組成物が合成樹脂と板状充填材とを含むことを特徴とする歯間清掃具1。【選択図】 図1
