The invention provides a plug connector which, when abnormal heating occurs in a fitting portion with a counter connector, can sensitively cut off the current supply. The plug connector has: contacts; a body that holds the contacts; a metal shell that covers the body; and a printed circuit board on which the contacts are solder-connected. The body has a fitting portion with a counter connector. The board has a thermal protection circuit. The thermal protection circuit has a temperature switch that detects a temperature, and an FET that is disposed in a power supply wiring of the board. When the detected temperature of the temperature switch exceeds a predetermined temperature, the power supply wiring is cut off by the FET. In the plug connector, the board has a heat conduction pattern that conducts heat of the metal shell 60 to the temperature switch.