Heat-exchanger protection structure

A heat-exchanger protection structure includes a vehicle-body-side member (2), a heat exchanger unit (1), and a plurality of attachment pins (3). The vehicle-body-side member (2) includes an upper member (21) and a lower member (22), which have a plurality of attachment holes (21a, 22a), respectively. The heat exchanger unit (1) includes a heat exchanger (11). The attachment pins (3) are attachable on and detachable from the heat exchanger (11), having a fragile portion (32a; 33a) capable of being broken when external force larger than a predetermined value acts on the attachment pin (3). The heat exchanger unit (1) is supported on the vehicle-body-side member (2) by the attachment pins (3) being inserted into the attachment holes (21a, 22a), At least one of the fragile portions (32a; 33a) is broken in case of a vehicle crash to protect the heat exchanger (11) against damage,