Abstract: An electrical connector that comprises a housing with a longitudinal axis that extends in the mating direction. Several terminal receiving cavities are arranged inside the housing and extend parallel to one another in the direction of the longitudinal axis of the housing. An insertion chamber is defined by wall sections of the terminal receiving cavities and serves for inserting the secondary locking element from the mating side. The chamber is open toward the mating end of the housing, and with openings that are provided in the wall sections of the terminal receiving cavities define the insertion chamber and serve for receiving locking knobs of a secondary locking element inserted into the insertion chamber.