A heat exchanger is provided to prevent the deterioration of performance by preventing the deformation or deviation of heating fins joined with a support by brazing. A support(30) has curved parts(60) formed with divisional parts(70) at any one of un upper or lower side in the air flow direction and cutout parts(80) at the other side, wherein the divisional parts and the cutout parts cross each other in the zig and zag shape.
