In a honeycomb structure (1), which is a heat exchange member, when the thermal conductivity of the material of dividing walls (4) is λ [W/K·m], and within the cell structure of the honeycomb structure (1), the wall thickness of the dividing walls (4) is t [mm] and the cell density is ρ [unit/square inch], the relationships are t ≥ 0.2, ρ > 100, 20 ≤ t × ρ ≤ 250, and 10,000 ≤ λ × ρ.
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