PROBLEM TO BE SOLVED: To provide an interdentium cleaning tool excellent in insertability and folding resistance of a cleaning part.SOLUTION: An interdentium cleaning tool comprises: a base material part 10 having a handle base material part 11 and a core base material part 12 consisting of first and second shaft parts and a soft part 20 including a cleaning soft part with a covering part. In the measurement of which a load P is applied vertically downward to a position of L (mm) from a boundary of the first and second shaft part to a distal end side of the first shaft part while holding a base end side terminal of the first shaft part as a fixed end and a distal end side terminal as a free end, when an amount of flexure in applying the maximum value of a load area where the first shaft part is elastically deformed is defined as Ymax, a base end side terminal diameter of the first shaft part is defined as d1(mm), and a diameter at a load application position is defined as d2(mm), an elastic modulus E of the core base material part 12 as shown by formula (1)E=[64 P/(Ymax*π)]*(m+n) is 3000 MPa or more.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】挿入性及び清掃部の耐折れ性に優れた歯間清掃具の提供。【解決手段】ハンドル基材部11と第1、第2軸部からなる芯基材部12と有する基材部10と、被覆部を有する清掃用軟質部を含む軟質部20を備え、第1軸部の基端側末端を固定端、先端側末端を自由端として水平方向に保持し、第1、第2軸部の境界から先端側へL(mm)の位置に荷重Pを鉛直方向下方に負荷する測定にて、第1軸部が弾性変形する荷重領域の最大値を負荷した時の撓み量をYmax、第1軸部の基端側末端径をd1(mm)、荷重負荷位置での径をd2(mm)とした場合、式(1)E=[64P/(Ymax・π)]・(m+n)で示される芯基材部12の弾性率Eが3000MPa以上である歯間清掃具。【選択図】図1
