The invention relates to a plug connector (1) for hollow profiles (4) in spacer frames for insulated glass panes. The plug connector (1) comprises at least two connector parts (2, 3) which may be plugged together and which have an essentially U-shaped or rectangular cross-section, which, in the plugged position, have adjacent side walls (6,17) and a positive fit (9). One connector part (2) has at least one retainer element (12) on the side walls (6) thereof (12) with a corresponding wall opening (13). In order to form the positive connection (9), the other connector part (3) has a projection (10) with a positive fit engagement in the wall opening (13) of the retainer element (12) when in the plugged position.