Connector, Electric Wire with Connector, and Medical Device Sensor

The invention discloses a connector, of which an object-side terminal pin is easy to insert and difficult to pull out, an electric wire with the connector, and a medical device sensor. Provided is a connector including a connector terminal having a terminal base connectable to the electric wire and an electrical connection portion connected to the object-side terminal pin, and a connector housingconfigured to house the connector terminal therein. The connector housing has a tubular inner surface surrounding the connector terminal. The connector terminal includes flat elastic contact pieces arranged at intervals around a central axis. Each elastic contact piece includes a contact portion extending along the central axis and being curved, a base portion limiting the movement of a contact portion, and a distal end portion located outward in a direction orthogonal to the central axis of the contact portion. When the contact portion, receiving a pressing force toward the cylindrical innerperipheral surface side fr