Abstract: In an electrical connector which has a first insulator (1a), a first contact (7) supported by the first insulator, a second insulator (2a) faced to the first insulator in a first direction, and a second contact (2a) supported by the second insulator, the second insulator has a side wall defining a groove (9) extending along the first insulator to have a first and a second part arranged in a second direction (A2) perpendicular to the first direction. The first contact has a first contacting portion (7a) inserted into the first part and carried towards the second part by relative movement between the first and the second insulators in the second direction. The second contact has a second contacting portion (8a) being of a flat shape, placed in the second part, and supported by the side wall. The second contacting portion extends in a direction approximate to the second direction.