SEAT

A seat provided in a moving body includes: at least one piezoelectric sensor including a first surface located on a side of a body of a sitter and a second surface located opposite the first surface, the piezoelectric sensor configured to sense heartbeat-induced body vibrations of the sitter through the first surface; and at least one supporting member disposed inside a recess which is formed in at least one of a seating surface of the seat and a back surface of the seat, the supporting member supporting the piezoelectric sensor under the second surface of the piezoelectric sensor. A gap is provided in at least part of an area between a surface of the supporting member and an inner wall of the recess so that the surface of the supporting member and the inner wall of the recess do not come into contact with each other.