An electrical connector part for connecting to a mating electrical connector part includes: a housing that has an insertion portion for making a plug-in connection with the mating electrical connector part, and a locking element, arranged moveably on the housing, for locking the mating electrical connector part to the housing in a locked position, and which is movable out of the locked position in order to release the locking connection between the mating electrical connector part and the housing when in an unlocked position; and a connecting device that connects the locking element to the housing and has a guide portion, a guide element guided at the guide portion, and a spring element, the spring element having a locking leg for latching the guide element to the guide portion in the locked position and/or the unlocked position.