To provide a structure for coupling a heat exchanger stably with a receiver tank while taking account of the abutting part between a coupling member and a header pipe.

The coupling structure for heat exchanger comprises a heat exchanger 1 having a tube end to be coupled with a header pipe 6, and a receiver tank 2 to be coupled with a bracket 30 wherein the bracket comprises a first part 31 for encircling the receiver tank 2 entirely or partially and having a curvature corresponding to the outer circumferential surface thereof, and a second part 32 extending from the first encircling part, while encircling a part thereof, oppositely to the connecting direction of header pipe and having a curvature corresponding to the outer circumferential surface thereof. The first and second encircling parts 31, 32 abut against the outer circumferential surface of the receiver tank 2 which is then brazed integrally with the heat exchanger and the bracket.