A heat pipe heat exchanger and a method for fabricating the same are disclosed. A heat pipe heat exchanger 1 is provided with a heat pipe 2, and a heat block 3 having a heat pipe-holding hole 3A, and a fin 4 having a fin base portion 4A, to which the heat pipe 2 is joined by a heating tube expansion method. The heat pipe 2 is plastically deformable and in which a predetermined amount of hydraulic fluid 2a is sealed. The heat pipe 2 is composed of a pipe having a cross section except a perfect circle. The heat pipe-holding hole 3A and the fin base portion 4A are composed of holes each having a cross section except the perfect circle.