The present invention limits measurement error and sensor element damage. When a contact type sensor (200) is placed in close contact with skin (10) a gap (200a) is formed between the skin (10) and a sensor element (214). The contact type sensor (200) is provided with a water repellent resin base plate (212) and a water absorbing sheet (211) that together with the skin (10) and the sensor element (214) surround the gap (200a).
