An electrical connector connects to a mating connector in a first direction. The electrical connector includes a housing, a plurality of terminals, a terminal arrangement board made of an electrical insulator for aligning and holding the terminals, and a metal plate attached to the housing at a position facing both surfaces of the terminal arrangement board for connecting to the mating connector. The metal plate has a lock portion at a position facing one surface of the terminal arrangement board. The lock portion engages a latch portion of the mating connector in the first direction when the electrical connector is connected to the mating connector. The metal plate has an elastic pressing portion at a position facing the other surface of the terminal arrangement board. The elastic pressing portion presses the mating connector in a second direction perpendicular to the first direction when the electrical connector is connected to the mating connector.