Connector, electric wire component, and medical device sensor

To provide a connector into which a mating terminal pin is easily inserted and of which it is hardly pulled out, an electric wire with the connector, and a medical device sensor.SOLUTION: A connector according to the present invention includes: a connector terminal including a terminal base portion to which an electric wire is connectable and an electric connector to which a mating terminal pin is connected; and a connector housing including a terminal housing portion. The terminal housing portion includes a tubular inner circumferential surface surrounding the electric connector, and the electric connector includes elastic contact pieces arranged at intervals from each other around a central axis. Each of the elastic contact pieces includes: a contact portion that extends along the central axis and is curved; a base portion that restricts the contact portion from moving; and a distal end portion that is positioned outward in a direction orthogonal to the central axis of the contact portion. The contact porti