An electrical plug-in connector having a first housing part and having a second housing part, blade contact elements being arranged in the first or second housing part and spring contact elements being arranged in the second or first housing part which are adapted to the blade contacts and can be inserted therein, has a locking clip which, when it engages around the first or second housing part in a manner substantially parallel to the plug-in direction when the two housing parts are plugged into each other, can be locked in or on the second or first housing part.