A connector includes: a casing that has a housing space, a through hole communicating the housing space with an external space, and an electric wire insertion hole, and that holds a connection terminal connected to a counterpart device; a wiring material that has a distal end part inserted into the housing space via the electric wire insertion hole and a conductor part exposed from a covering at the distal end part, the exposed conductor part being curved at a curved part and connected to the connection terminal; and a conductive voltage detection terminal that has a connection part connected to the exposed conductor part at a position closer to the covering than a curved part and a voltage detection part facing the through hole, and that is provided by branching from a conduction path between the connection terminal and the conductor part.