To provide an electrical connector and its manufacturing method so that the strength of a housing is maintained and the arrangement pitch of a contact can be made narrower.

A cross-section shape of a pin contact 10 is made narrower in such a manner that a contact face 12 and an opposite side face 13 are shaped as a taper shape or the round shape R. When the pin contact 10 is pressed in the direction of a retention groove 21, the retention groove 21 of a housing 20 is in the form such that the opposite side face 13 makes close contact with the inner wall of the retention groove 21. With the pin contact 10 is pressed backwardly by an insert die, an electrical connector is arranged in a molding die, and can be produced by integrally molding resin.