A heat exchanger having a fixing structure, comprising: a plurality of bent heat exchangers layered on each other in a multilayer arrangement; and a plurality of plates (110, 210, 310) respectively fixed to respective ends of the plurality of heat exchangers, wherein portions of two of the plurality of plates (110, 210, 310) overlap each other, and the heat exchangers respectively fixed to the two of the plurality of plates (110, 210, 310) are connected and fixed to each other by fastening a fastening member to the overlapping portions; wherein the plurality of heat exchangers include first to third heat exchangers (100,200,300), and the plurality of plates (110, 210, 310) include first to third plates respectively corresponding to the first to third heat exchangers (100,200,300); characterized in that the first plate includes a first base disposed in an end portion of the first heat exchanger; and a first stopper integrally formed with the first base, overlapping the second plate, and fixed to the second plate and the second heat exchanger by the fastening member; and wherein the first stopper includes a first convex portion and a first concave portion, both provided at positions not interfered with by a hair pin pipe installed in the first heat exchanger; and wherein the first convex portion and the first concave portion are provided as a plurality of first convex portions and first concave portions alternately disposed, and a hair pin pipe is disposed in each of the plurality of first concave portions. a plurality of bent heat exchangers layered on each other in a multilayer arrangement; and a plurality of plates (110, 210, 310) respectively fixed to respective ends of the plurality of heat exchangers, wherein portions of two of the plurality of plates (110, 210, 310) overlap each other, and the heat exchangers respectively fixed to the two of the plurality of plates (110, 210, 310) are connected and fixed to each other by fastening a fastening member to the overlapping portions; wherein the plurality of heat exchangers include first to third heat exchangers (100,200,300), and the plurality of plates (110, 210, 310) include first to third plates respectively corresponding to the first to third heat exchangers (100,200,300); wherein portions of two of the plurality of plates (110, 210, 310) overlap each other, and the heat exchangers respectively fixed to the two of the plurality of plates (110, 210, 310) are connected and fixed to each other by fastening a fastening member to the overlapping portions; wherein the plurality of heat exchangers include first to third heat exchangers (100,200,300), and the plurality of plates (110, 210, 310) include first to third plates respectively corresponding to the first to third heat exchangers (100,200,300); characterized in that the first plate includes a first base disposed in an end portion of the first heat exchanger; and a first stopper integrally formed with the first base, overlapping the second plate, and fixed to the second plate and the second heat exchanger by the fastening member; and wherein the first stopper includes a first convex portion and a first concave portion, both provided at positions not interfered with by a hair pin pipe installed in the first heat exchanger; and wherein the first convex portion and the first concave portion are provided as a plurality of first convex portions and first concave portions alternately disposed, and a hair pin pipe is disposed in each of the plurality of first concave portions. the first plate includes a first base disposed in an end portion of the first heat exchanger; and a first stopper integrally formed with the first base, overlapping the second plate, and fixed to the second plate and the second heat exchanger by the fastening member; and wherein the first stopper includes a first convex portion and a first concave portion, both provided at positions not interfered with by a hair pin pipe installed in the first heat exchanger; and wherein the first convex portion and the first concave portion are provided as a plurality of first convex portions and first concave portions alternately disposed, and a hair pin pipe is disposed in each of the plurality of first concave portions.