Connector, and header and socket which are used in connector

A connector comprising:

• a socket including a socket housing having substantially a rectangular shape, a socket-side signal terminal disposed in the socket housing, and a socket-side power source terminal disposed in the socket housing;
• and
• a header including a header housing having substantially a rectangular shape, a header-side signal terminal disposed in the header housing, and a header-side power source terminal disposed in the header housing,
• wherein, while the socket housing is engaged with the header housing, the socket-side signal terminal contacts the header-side signal terminal, and the socket-side power source terminal contacts the header-side power source terminal,
• wherein the socket-side signal terminal and the socket-side power source terminal are arranged in a longitudinal direction of the socket housing,
• wherein the socket-side power source terminal and the header-side power source terminal include a plurality of contact portions which contact each other and arranged in the longitudinal direction,
• wherein the socket-side power source terminal further includes three tongues,
• wherein the plurality of contact portions are provided at the three tongues, respectively,
• wherein a recess is formed in one contact portion out of a contact portion of the socket-side power source terminal and a contact portion of the header-side power source terminal which contacts the contact portion of the socket-side power source terminal, and
• wherein at least one of the three tongues contacts with the header-side power source terminal at the recess.