In a temperature regulation unit (10), a flow passage (50) for a fluid is formed between a plurality of rod-shaped members (30) which extend parallel to each other so as to be spaced apart from each other and are formed from porous metal; in the flow passage (50), the fluid flows along a flow direction which is a direction orthogonal to a direction in which the rod-shaped members (30) extend; and the flow passage (50) meanders along the flow direction.