PROBLEM TO BE SOLVED: To provide a heat conducting structure capable of maintaining high heat conductivity in the extending direction of a graphene sheet without lowering strength, and a heat diffusion device provided with the heat conducting structure. A thermal conductive structure (10) includes a graphite structure (11) formed by stacking a plurality of graphene sheets (15) and an outer peripheral surface (including an upper surface (11A) and a lower surface (11B)) of the graphite structure (11). And a coating layer 20 formed on. In the heat conducting structure 10, each outer peripheral surface intersects the basal surface of the graphene sheet 15 at a predetermined inclination angle θ so that the edge portion of the graphene sheet 15 appears on all the outer peripheral surfaces of the graphite structure 11. ing. [Selection diagram] Figure 1
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