An electrical plug connector includes a housing and a plug contact. The housing includes a housing body and a housing part which together form the housing with a receiving chamber therein. The housing body and the housing part are movable relative to one another perpendicularly to a plug-in direction and can be stably fixed to one another in a pre-locking position and in an end-locking position. The plug contact is connected to an electrical connection line and has a detent spring. The plug contact is inserted along the plug-in direction into the receiving chamber. The housing part has a locking arm having a detent protrusion. The detent spring engages the detent protrusion after the plug contact is inserted into the receiving chamber in the pre-locking position. The locking arm fixes the plug contact in the receiving chamber in a form-fit manner in the end-locking position.