An angle member 9 is fixed to an insert 5 in a state in which a mounting portion 9a of the angle member 9 is fitted in a groove portion 5a depressed towards a core portion 4 side, whereby there is no case where an impact force applied to the angle member 9 and a connecting bar is transmitted directly to tubes 2, so that a possibility that a damage such as a crack is generated in the tubes 2 can be reduced. Consequently, the large vibration of a heat exchanging unit 7 can be suppressed while preventing the direct transmission of the impact force applied to the angle member 9 to the tubes 2.