PROBLEM TO BE SOLVED: To provide a periodontal pocket depth measuring device for accurately measuring the depth of a periodontal pocket even when tartar or the like is attached to the tooth root. A periodontal pocket depth measuring device 1 for measuring the depth of a periodontal pocket includes a main body portion 10, a plate-shaped probe 20 held by the main body portion and protruding from one end of the main body portion, and a main body portion. It protrudes from one end in the same direction as the protrusion direction of the probe, is movably held in the main body in a direction parallel to the protrusion direction, and moves with the lip 30 provided around the probe in the direction opposite to the protrusion direction of the lip. It has a detection unit that detects the amount as the depth of the periodontal pocket. The probe includes a recess 221 at the tip in the protruding direction and in the center in the plate width direction. [Selection diagram] Fig. 3【課題】歯根に歯石等が付着している場合であっても、歯周ポケットの深度を正確に測定する歯周ポケット深度測定装置を提供する。【解決手段】歯周ポケットの深度を測定する歯周ポケット深度測定装置１は、本体部１０と、本体部に保持されると共に本体部の一端から突出する板状のプローブ２０と、本体部の一端からプローブの突出方向と同一方向に突出し、突出方向と平行な方向に移動自在に本体部に保持されると共に、プローブの周囲に設けられるリップ３０と、リップの突出方向と反対方向への移動量を歯周ポケットの深度として検出する検出部と、を有する。プローブは、突出方向の先端及び板幅方向の中央に窪み部２２１を備える。【選択図】図３
