A large-size weighty radiator (1) having an array of rubber dampers (21) at the bottom is mounted between transversely spaced side members (2) of a vehicle body, by a structure (M) including a hollow frame portion having a transversely extending body part (H1) and a pair of fixed parts (H2) fixed to the side members (2), and a receiving portion (H3) formed on the frame portion for receiving the array of rubber dampers (21) inserted thereto.