A lamp fixing unit capable of simplifying the manufacture of a backlight assembly by eliminating the need for manual procedures is presented. The lamp fixing unit includes a fixing member and a lamp holder. The fixing member includes a fixing body and at least one receiving portion. The lamp holder includes a holder body and a conductive socket. The holder body includes a board insertion portion, a power supply member, and a lamp fixing member. Thus, the power supply member may be easily coupled to and uncoupled from the lamp holder, and the lamp may be easily grounded.