Abstract: A terminal provided with a contact surface to be brought into contact with a mating terminal. In order to improve the strength of the contact surface, the terminal is constructed so that an elastic contact leaf is provided inside a square cylindrical contact portion into which a mating terminal is inserted and that the contact surface expanding in the direction of the elastic contact leaf is formed in a wall portion opposite to the elastic contact leaf in the contact portion. The contact surface is formed into a plane shape where the length of the central portion is set to be greater than the length of both sides in the direction of inserting the mating terminal.