A lamp socket includes a socket body, a power supplying member and a socket cover. The socket body has a connecting hole formed in the socket body. The connecting hole is opened. The power supplying member is disposed in the connecting hole and an electrode supporting terminal having a supporting groove, so that supports an electrode portion of a lamp disposed in the power supplying member. The socket cover is partially and separably insertable in the connecting hole, to fix the electrode portion of the lamp. A backlight assembly includes a receiving container, a plurality of lamps and lamp sockets.