PURPOSE: To easily mount a radiator on a car body by one step action by fitting a pin of a spring member, arranged in a lower surface of the radiator, to a mounting hole on the car body side, further fitting similarly a button of a spring member, arranged in an upper surface, to a button hole on the car body side.

CONSTITUTION: In the case of mounting a radiator 21 in a car body, first the radiator 21 is tiled to fit a pin 29, protrusively provided in a spring member 26 in a lower side in the radiator 21, relating to a mounting hole 32 of a mounting bracket 31 welded to a car body 30 on the lower side. Next the radiator 21 is erected to fit a button 25, protrusively provided in a spring member 22 in the upper side, slid to a button hole 34 drilled in a car body 33 in the upper side. Here the spring member 22 in the upper side is pressed to the car body 33 in the upper side to be deflected through a horizontal part 24 and the button 25, and further since an upper surface 25A of the button 25 is positioned low to a side of a vertical part 23 of the spring member 22, that is, to a slide direction, the button is smoothly fitted to the button hole 34, also to prevent deviating in the opposite direction to the vertical part 23 after fitting.