To make it possible to stably measure heartbeats even if seated persons physically differ and to measure the heartbeats of even a seated person other than a driver. A vehicle seat includes : a seat back (104) ； and a measuring device including a plurality of sensors (20A, 20B, 20C) that are provided in the seat back (104) and that acquire body potentials of the seated person, and an arithmetic operation device that computes electrical signals relating to the detected body potentials to obtain an electrocardiographic signal of the seated person. The sensors (20A, 20B, 20C) are each capacitively coupled sensors. The sensor (20A) is arranged at a lower right position relatively to the sensor (20B) and the sensor (20C) while facing a front surface of the seat back (104) if a surface of the seat back (104) facing the seated person is assumed as the front surface. The sensor (20A) and the sensor (20C) are arranged so that a heart of the seated person is located in a zone (20AC) if the zone (20AC) is defined from the sensor (20A) and the sensor (20C).
