PULSE WAVE SENSOR

This pulse wave sensor comprises: a strain-generating body having a circular opening; a resin layer covering one surface of the strain-generating body; and a strain gauge which is disposed on the other surface opposite to the one surface of the strain-generating body and has a Cr mixed phase film as a resistor, wherein 0.059≤t≤0.124 when the material of the strain-generating body is SUS and d=32, 0.046≤t≤0.099 when the material is SUS and d=22, 0.030≤t≤0.067 when the material is SUS and d=13, 0.026≤t≤0.034 when the material is SUS and d=7, 0.084≤t≤0.166 when the material is copper and d=32, 0.066≤t≤0.132 when the material is copper and d=22, 0.044≤t≤0.088 when the material is copper and d=13, 0.032≤t≤0.050 when the material is copper and d=7, 0.097≤t≤0.212 when the material is aluminum and d=32, 0.079≤t≤0.168 when the material is aluminum and d=22, 0.050≤t≤0.107 when the material is aluminum and d=13, and 0.038≤t≤0.063 when the material is aluminum and d=7, where d [mm] is the diameter of the circular opening and t [mm] is the thickness of the strain-generating body. Pulse wave detection is based on the change in the resistance value of the resistor accompanying the deformation of the strain-generating body.