Plug connector

A plug connector attachable to and detachable from a receptacle connector including a receptacle insulator formed from a resin and having an annular outer peripheral wall forming an engagement recess on an inner peripheral side, and a receptacle contact group that is elastically deformable, mountable on a circuit pattern of a receptacle side circuit board and supported by the receptacle insulator, the plug connector comprising:

• a plug insulator having an outer peripheral wall that includes a pair of longitudinal walls and a pair of transverse walls together constituting an annular projection to fit into the engagement recess;
• a plug contact group arranged in a row and supported by the longitudinal walls of the outer peripheral wall, contacts the receptacle contact group when the annular projection is fit into the engagement recess, and is connected to a circuit pattern of a plug side circuit board;
• and
• a plug connector fixing bracket mounted on the transverse walls,
• wherein the plug connector fixing bracket includes a receiving surface facing a bottom surface of the transverse walls, a transverse outer wall and a transverse inner wall that bend from the receiving surface and respectively extend along an outer surface and an inner surface of the transverse walls, and a pair of longitudinal outer walls that bends from the receiving surface and extends along outer surfaces of the longitudinal walls, wherein one of the transverse outer wall and the transverse inner wall of the plug connector fixing bracket includes a pair of separated walls, that bend from the receiving surface, located across a center of a longitudinal direction of the transverse walls of the plug insulator, wherein the pair of transverse walls of the plug insulator each include a pair of fixing bracket mounting grooves to engage with a respective pair of separated walls, and wherein a portion of each transverse wall is located between a respective pair of fixing bracket mounting grooves and extends between a respective pair of separated walls, and
• wherein each of the pair of separated walls and the pair of longitudinal outer walls of the plug connector fixing bracket extend from the receiving surface over the plug insulator in a direction in which the plug connector fixing bracket is fixed to the plug insulator so as to be able to contact a mounting surface of a plug side circuit board.