Sensor module and blood pressure measurement device

A blood pressure measurement device comprising:

• a sensor module including:
• a sensor base;
• a pressure sensor portion fixed to the sensor base;
• a sensor head cover fixed to the sensor base, the sensor head cover
• including a rubber portion that forms, on an outer surface, at least a region that comes into contact with a living body and that allows pressure from the living body to transfer to a side of the pressure sensor portion,
• including a protrusion portion projecting toward the living body, an end surface thereof being formed with a flat surface, and at least a portion of the protrusion portion being formed from the rubber portion, and
• forming a gap portion between an inner surface, at least a portion of the inner surface being composed of the rubber portion, and the sensor base and the pressure sensor portion;
• and
• a soft portion disposed in the gap portion at least between the rubber portion and the pressure sensor portion, the soft portion
• having a lower hardness than the rubber portion and
• allowing pressure from the rubber portion to transfer to the pressure sensor portion;
• an attach portion including:
• an opening portion provided at a position opposite the living body, the sensor module being disposed in the opening portion, and
• an end surface that curves conforming to a shape in the circumferential direction of a portion of the living body;
• a fastener provided on the attach portion;
• and
• a case provided on the attach portion, the case housing the sensor module, wherein
• the sensor head cover includes:
• an opening portion formed in a region, opposite the pressure sensor portion, of the sensor base;
• a first portion located in the opening portion of the sensor head cover and formed from an identical material to the rubber portion;
• and
• a second portion located on an outer side of the first portion in the opening portion and formed from an identical material to the soft portion, the second portion closing off space between an edge of the opening portion and the first portion.