This chassis (2) comprises a clad material obtained by roll bonding a first layer (21), which is formed from an austenitic stainless steel, a second layer (22), which is formed from Cu or a Cu alloy and which is laminated on the first layer, and a third layer (23), which is formed from an austenitic stainless steel and which is laminated on that side of the second layer which is opposite the first layer, wherein the thickness of the second layer is 15% or more of the thickness of the clad material.