MEASURING TOOL

To provide a measuring tool which hardly causes a prism mirror to be out of position and come off even when an object to be measured operates and can reduce a possibility that the prism mirror is broken when an impact load acts thereon.SOLUTION: A measuring tool comprises: a target member 50 which holds a prism mirror 51 and which has an end surface 56 which is disposed on a mirror vertex side in an axial direction of the prism mirror 51 and in which a plunger 54 with a ball 54a is provided; an attachment member 60 which has an outer surface 60a1 in which a through-hole 61 engaged by the ball is provided; a clamp 71 which fixes the attachment member 60 to an object to be measured so that an operation plain face of a work device 1A and the outer surface 60a1 are disposed in parallel; and a magnet 80 which detachably couples the target member 50 to the attachment member 60 in a state where the ball 54a is engaged with the through-hole 61.SELECTED DRAWING: Figure 3 【課題】計測対象物が動作してもプリズムミラーの位置ズレや脱落がし難く，かつ，衝撃荷重が作用した際のプリズムミラーの破損の可能性を低減できる計測治具を提供すること。【解決手段】プリズムミラー５１を保持し，プリズムミラー５１の軸方向におけるミラー頂点側に配置されボール５４ａを有するプランジャ５４が設けられた端面５６を有するターゲット部材５０と，ボールに係合される貫通孔６１が設けられた外側面６０ａ１を有する取付け部材６０と，作業装置１Ａの動作平面と外側面６０ａ１が平行に配置されるように取付け部材６０を計測対象物に固定するクランプ７１と，ボール５４ａを貫通孔６１に係合させた状態でターゲット部材５０を取付け部材６０に対して着脱可能に結合する磁石８０とを備える。【選択図】 図３