A plug connector for solder-mounting on a circuit board, comprising an insulating body and at least one oblong electrical plug contact held therein in a receptacle chamber, that extends between a foot part associated with a circuit board and a head part of the insulating body that faces the foot part at a distance. The at least one plug contact comprises at a front end that is close to the head part an accessible electrically contactable plug section, a central section adjacent to the plug section, and, adjacent to the central section, an exposed soldering section at a rear end that is close to the foot part. According to the invention, the central section comprises a rigid cylindrical holding zone adjacent to the plug section as well as a cylindrical flexible deformation zone extending between the holding zone and the soldering section, so that the plug section of the at least one plug connector can be shifted laterally in relation to the soldering section in case of a deformation of the deformation zone. Preferably, the deformation zone is made hollow and comprises a number of passages that permit a lateral deformation.