Abstract: Disclosed herein is a housing panel of an exhaust gas recirculation cooler which is used to manufacture a housing that houses therein a cooling module for cooling recirculation exhaust gas of a vehicle. The housing panel includes a pair of pre-side surface parts which forms respective side surface parts of the housing, and a pre-upper surface part which forms an upper surface part of the housing and is integrally formed between the pair of pre-side surface parts. Two bending parts each having an obtuse angle are formed in the pre-upper surface part at positions spaced apart from each other by a predetermined distance. The torsion caused by stress can be reduced, and the flatness and strength can be enhanced.