An electrical connector (100) includes an insulative housing (1) and a contact terminal (2). The insulative housing includes a first and a second primary faces (13, 12), and a passageway (11) extending between the first and second primary faces. The passageway defines a first opening (112) at the first primary face and a second opening (111) at the second primary face. The contact terminal is inserted into the passageway through the first opening. The contact terminal is formed with a contact section (24) having a pair of blocking portions (25) projecting along a transversal direction of the first opening. The blocking portion is configured to cooperate with the first primary face to prevent the contact section from entering the first opening