A plug connector includes: a housing module having a mating end and including a first housing and a second housing assembled with the first housing to define a cavity therebetween; and a mating board received in the cavity and exposed to an exterior at a position close to the mating end; wherein the first housing has a main portion and a tongue extending from the main portion, the second housing has a receiving space receiving the tongue, and the tongue is deformed to latch within the receiving space.