PROBLEM TO BE SOLVED: To provide a non-slip tool for a dental handpiece which is hard to roll even by a slight force from the outside when placed on a flat treatment table, and a dentist who is hard to roll and does not feel discomfort or slipperiness when grasped. Provide non-slip device for handpiece. SOLUTION: An anti-slip tool 10 has a mounting portion 1 for mounting on a grip portion of a dental handpiece and a plurality of non-slip small pieces 2 provided on an outer peripheral surface 14 of the mounting portion； When a regular polygon is virtually drawn so as to circumscribe the outer peripheral surface 14 of the mounting portion 1 on the cut surface at the position where the diameter of the outer peripheral surface 14 of the portion is maximum, the non-slip on the cut surface. The center point of the virtual perfect circle including the outer peripheral surface 14 of the small piece 2 is arranged on the line of the virtual equidistant line connecting the center point of the mounting portion 1 and the apex of the regular polygon. The non-slip piece 2 is arranged； and the apex of the non-slip piece 2 is arranged at the apex of the polygon, or on a line extending the virtual equidistant line further from the apex. It is characterized by being arranged. [Selection diagram] Fig. 2【課題】平坦な治療台に置いた際に外部からのわずかな力によっても転がりにくい歯科ハンドピース用滑り止め具、及び、転がりにくく、把持した際に違和感や滑りやすさを感じることのない歯科ハンドピース用滑り止め具を提供する。【解決手段】滑り止め具１０は、歯科用ハンドピースの把持部に装着するための装着部１とその装着部の外周面１４に設けられた複数の滑り止め小片２とを有すること；前記装着部の外周面１４の直径が最大となる位置における切断面での前記装着部１の外周面１４に対して外接するように正多角形を仮想的に描いた場合、その切断面における前記滑り止め小片２の外周面１４を一部に含む仮想真円の中心点が、前記装着部１の中心点と前記正多角形の頂点と結んだ仮想の等分割線の線上に配置されるように、前記滑り止め小片２が配置されていること；及び前記滑り止め小片２の最頂点が、前記多角形の頂点に配置されるか、又は前記仮想の等分割線を前記頂点から更に延長した線上に配置されること；を特徴とする。【選択図】図２
