PROBLEM TO BE SOLVED: To provide a dental handpiece which has a simple structure, is excellent in durability, and is suitably used for interdental cleaning or the like.SOLUTION: A dental handpiece 1 includes: a handpiece body 4 which incorporates an axial rotation drive transmission part 13 a distal end head part 2 which is continuously connected to a distal side of the handpiece body 4 and includes a head housing 20 and a tool holding member 19 which is internally packaged in the head housing 20 to be movable in a reciprocating manner in a direction perpendicular to an axial center L1 of the axial rotation drive transmission part 13 and has a hollow cylindrical shape for inserting and detachably holding a dental tool 5. A columnar cam part 16 which is eccentric with respect to the axial center L1 is provided at a distal end part of the axial rotation drive transmission part 13, and a concave groove 195 where the columnar cam part 16 can be fit and inserted is formed along a circumferential direction on an outer peripheral part of the tool holding member 19. A circular bearing 17 which can make relative sliding contact is externally packaged in the columnar cam part 16. The columnar cam part 16 is fit and inserted in the concave groove 195 with the bearing 17 externally packaged.COPYRIGHT: (C)2014,JPO&INPIT【課題】構造が簡単でありながら、耐久性に優れ、歯間の清掃等に好適に用いられる歯科用ハンドピースを提供する。【解決手段】軸回転駆動伝達部13を内蔵するハンドピース本体部4と、前記ハンドピース本体部4の先側に連接されたヘッドハウジング20を含む先端ヘッド部2と、該ヘッドハウジング20に前記軸回転駆動伝達部13の軸心L1と直交する方向に往復移動可能に内装され、歯科用工具5を着脱自在に挿通保持し得る中空円筒状の工具保持部材19とを備えた歯科用ハンドピース1であって、前記軸回転駆動伝達部13の先端部には、前記軸心L1と偏心した円柱状カム部16が設けられ、前記工具保持部材19の外周部には、前記円柱状カム部16を嵌挿し得る凹溝195が周方向に沿って形成され、前記円柱状カム部16には相対摺接可能な円環状軸受17が外装され、前記円柱状カム部16は該軸受17が外装された状態で前記凹溝195に嵌挿されている。【選択図】図2
