Plug connector for an electrical and/or optical plug connection, wherein the plug connector comprises a first plug component and a second plug component, the first plug component has an elongate plug-in portion and the second plug component has an elongate receiving jacket portion with an insertion opening, and, in a position in which the first and second plug components are completely plugged one into the other, the plug-in portion is inserted into the receiving jacket portion through the insertion opening; the plug connector also comprises locking means including a locking pin for locking together the first and second plug components the locking pin being located inside the receiving jacket portion and/or the plug-in portion in the completely plugged-in position and being movable between the locking position and the unlocking position on a path of movement with a tangential component, viewed from the longitudinal center line.