Abstract: The object of the present invention is to provide an electrical connector in which a mechanism for preventing the incorrect insertion of terminals is part of the housing lances so that the incorrect insertion of terminals is prevented. Housing lances 6 are formed in the housing 2 of an electrical connector 1. The housing lances 6 have an inclined surface 8 which protrudes into cavities 4, and recesses 20, which accommodate projections 76 used to prevent the incorrect insertion of terminals 70, are formed in the inclined surfaces 8. Stop surfaces 22 which are contacted by the projections 76 are formed in the front portions of the recesses 20. As a result, further insertion of the terminals 70 is prevented so that incorrect insertion is prevented.