PROBLEM TO BE SOLVED: To provide an interdental cleaning tool which has excellent properties for insertion into an interdental portion and can ensure sufficient cleaning properties in a state in which saliva interposes.SOLUTION: An interdental cleaning tool 1 includes: a handle base material 11 formed of synthetic resin； and a cleaning part 2 formed by externally attaching a cleaning body 21 made of elastomer on a core part 12 having a shape of an elongated shaft of the handle base material 11. The cleaning body 21 includes: a cover part 21a formed to a tip of the core part 12； and plural protrusions 21b for cleaning protruding outward from the cover part 21a. The cleaning body 21 is constituted by styrene-based thermoplastic elastomer having a contact angle with respect to water of 75°-95° and Shore A hardness of A30-A50. When a dynamic friction coefficient in a state of interposing no water in a cleaning portion 2A is defined as μd and a dynamic friction coefficient in a state of interposing water is defined as μw, a relational expression of 0.9×μd≤μw is satisfied between both dynamic friction coefficients.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】歯間への挿入性に優れ、しかも唾液が介在した状態での清掃性を十分に確保可能な歯間清掃具を提供する。【解決手段】合成樹脂からなるハンドル基材１１と、ハンドル基材１１の細長い軸状の芯部１２にエラストマからなる清掃部本体２１を外装してなる清掃部２とを備え、清掃部本体２１が、芯部１２の先端部まで形成されている被覆部２１ａと、被覆部２１ａから外方へ突出する清掃用の複数の突起部２１ｂとを有する歯間清掃具１であって、清掃部本体２１を、水に対する接触角が７５°～９５°で、ショアＡ硬さがＡ３０～Ａ５０のスチレン系熱可塑性エラストマで構成し、清掃部２Ａにおける、水を介在させていない状態での動摩擦係数をμｄ、水を介在させた状態での動摩擦係数をμｗとしたときに、両動摩擦係数間に０．９×μｄ≦μｗの関係式が成立する。【選択図】図１
