A connector unit is connectable to a printed circuit board (“PCB”) and includes a first connector and a second connector. The first connector includes a first connector body having a receiving hole at one side, and a first terminal part disposed inside the receiving hole. The second connector includes a second connector body, and first and second fixing protrusions. The second connector body has a second terminal part formed at a first side. The second terminal part is inserted in the receiving hole, and is electrically connected to the first terminal part. First and second fixing protrusions are disposed at top and bottom surfaces of the second connector body, and are fixed to upper and lower edges of the receiving hole.