A temperature regulation unit (10) includes a plurality of stacked porous metal structures (for example, metal fiber structures (40, 42)) each of which has a plurality of rod-shaped members (32, 34) extending parallel to each other so as to be spaced apart from each other and a connection member (24, 26) connecting the respective rod-shaped members (32, 34) and is formed from metal, the respective rod-shaped members (32, 34) of the respective porous metal structures extend parallel to each other, and a flow passage (50) for a fluid is formed in a gap between the respective rod-shaped members (32, 34).