A wire-to-board connector includes a plug which is attached to a wire, and a receptacle which is mounted on a connector mounting surface of a board. The plug and the receptacle are each formed of metal, and the plug is mated with the receptacle to thereby connect the wire to the board. The wire-to-board connector has the following structure. A wire direction corresponding to a longitudinal direction of the wire in the vicinity of the plug when the plug is mated with the receptacle is parallel to the connector mounting surface of the board. A mating direction in which the plug is mated with the receptacle is a direction approaching the connector mounting surface of the board.