A multipole electrical plug-in connector part includes a connector housing, a protective cap, and a clamping body. The protective cap is lockable to the connector housing and has an inlet opening. The protective cap further has a fixing section. The fixing section and the connector housing are connected together. The clamping body has elastically resilient clamping surfaces and is connected to the fixing section. Electrical connecting lines extending through the inlet opening toward the fixing section are mechanically fixed in a force-fit manner between the clamping surfaces of the clamping body and inner wall sections of the connector housing.