The invention proposes a housing of an electrical connector including a contact holder and a front grid arranged for being mounted together, wherein: —the contact holder includes channels for receiving electrical contacts within, each channel being limited by resilient members stressable by an electrical contact whose position in the channel is not correct; —the front grid comprises a front panel with a plurality of transversal connecting windows for facing corresponding channels of the contact holder; characterized in that the housing includes members for locking the front grid to the contact holder by translating the front grid with respect to the contact holder according to a lateral direction.