Pulse wave detection device

A pulse wave detection device comprising:

• a sensor substrate having a mounting surface and a back surface;
• a light receiving element disposed on the mounting surface of the sensor substrate;
• a light emitting element disposed on the mounting surface separately from the light receiving element;
• and
• a light guide part having, on a side of the mounting surface of the sensor substrate, a first opening that surrounds the light receiving element, a second opening that corresponds to the first opening and is provided at a top part of a curved surface or in a vicinity of the top part, a third opening that surrounds the light emitting element, a fourth opening that corresponds to the third opening and is provided in the curved surface, a first light guide path having a reflective surface that couples the first opening with the second opening, and a second light guide path having a reflective surface that couples the third opening with the fourth opening.