A connector is configured such that a socket housing (31) is engaged with a header housing as to cause a socket-side signal terminal (32) to contact a header-side signal terminal and as to cause a socket-side power source terminal (33) to contact a header-side power source terminal. The socket-side signal terminal (32) and the socket-side power source terminal are arranged in a longitudinal direction of the socket housing (31). In the socket-side power source terminal and the header-side power source terminal, contact points to contact each other are arranged in the longitudinal direction of the socket housing (31). Tongues (35, 36) are formed in the socket-side power source terminal (33). The contact points are provided at the tongues (35, 36), respectively.