A lighting module comprising: a case which comprises an opening, a first and a second seat (202a, 202b); a light source unit (150A, 150B) having at least one light emitting device which is disposed in the case; a light guide plate which is placed within the case in the longitudinal direction of the case and is optically connected to the light source unit (150A, 150B); a diffusing plate which is disposed within the case in the longitudinal direction of the case and is placed below the light guide plate; and at least one projection which is disposed in the longitudinal direction of the case or is locally disposed on an inner surface of the case, wherein the case comprises a base portion, a first extending portion and a second extending portion which extend respectively from both ends of the base portion and a first flange portion and a second flange portion which extend respectively from ends of the first extending portion and the second extending portion, and the first extending portion and the first flange portion form a first seat and the second extending portion and the second flange portion form a second seat, and the at least one light emitting device is placed into each of the first seat and the second seat, wherein the opening is located between the first flange portion and the second flange portion, and wherein the projection is extended from the internal side face of the base portion, and fixes or supports the light guide plate, the lighting module being characterized in that the projection is arranged on the inner surface of the case which is located opposite to the opening with respect to the light guide plate, and in that that the case comprises a first connector and a second connector which are disposed on the external surface of the base portion, and wherein the first connector is arranged at one end of the external surface of the base portion and the second connector is arranged at the other end of the external surface of the base portion. a case which comprises an opening, a first and a second seat (202a, 202b); a light source unit (150A, 150B) having at least one light emitting device which is disposed in the case; a light guide plate which is placed within the case in the longitudinal direction of the case and is optically connected to the light source unit (150A, 150B); a diffusing plate which is disposed within the case in the longitudinal direction of the case and is placed below the light guide plate; and at least one projection which is disposed in the longitudinal direction of the case or is locally disposed on an inner surface of the case, wherein the case comprises a base portion, a first extending portion and a second extending portion which extend respectively from both ends of the base portion and a first flange portion and a second flange portion which extend respectively from ends of the first extending portion and the second extending portion, and the first extending portion and the first flange portion form a first seat and the second extending portion and the second flange portion form a second seat, and the at least one light emitting device is placed into each of the first seat and the second seat, wherein the opening is located between the first flange portion and the second flange portion, and wherein the projection is extended from the internal side face of the base portion, and fixes or supports the light guide plate, the lighting module being characterized in that the projection is arranged on the inner surface of the case which is located opposite to the opening with respect to the light guide plate, and in that that the case comprises a first connector and a second connector which are disposed on the external surface of the base portion, and wherein the first connector is arranged at one end of the external surface of the base portion and the second connector is arranged at the other end of the external surface of the base portion.