PROBLEM TO BE SOLVED: To provide a pulse wave sensor having improved measurement accuracy.SOLUTION: A pulse wave sensor 1 comprises: an attachment 12 which includes an opening 42 having a non-perfect circular shape in a plan view and to be pressed against a living body surface S1, and a sensor chamber 11 inside； a pressure sensor 13 which is displaced in accordance with a change in an internal pressure of the sensor chamber which changes in response to pulsation of a living body when the attachment is pressed against the living body surface； and a pulse wave detection unit 14 which detects a pulse wave on the basis of the displacement of the pressure sensor.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】測定精度が向上した脈波センサを提供すること。【解決手段】生体表面Ｓ１に押し当てられる平面視で非真円形の開口部４２、及び内部にセンサ室１１を有するアタッチメント部１２と、アタッチメント部が生体表面に押し当てられた際に、生体の脈動に対応して変化するセンサ室の内圧変化に応じて変位する圧力センサ１３と、圧力センサの変位に基づいて脈波を検出する脈波検出部１４と、を備える脈波センサ１を提供する。【選択図】図３
