A heat exchange component including: a pillar-shaped honeycomb structure; and a casing arranged so as to cover an outer circumferential face of the honeycomb structure. The casing includes an inner cylinder arranged so as to be fitted to the outer circumferential face of the honeycomb structure, a middle cylinder arranged so as to cover the inner cylinder, and an outer cylinder arranged so as to cover the middle cylinder such that a circumferential flow path serving as a flow path of a second fluid is formed between the inner cylinder and the outer cylinder. ... Ngk Insulators Ltd