To provide a technique for producing a composite material having no risk of scattering of a carbon material, and also having no risk of intervening of oxide.

As shown in Fig.(a), a carbon material 13 is charged to the bottom of a heat resistant vessel 28 with opened upper part. Next, as shown in Fig.(b), a matrix metallic material 29 of a solid phase is placed on the carbon nano material 13. As shown in Fig.(c), a cover 30 is put on the heat resistant vessel 28, and the vessel 28 is sealed, and heating is started. Then, the matrix metallic material 29 is softened, is made to flow and reaches the inner wall of the heat resistant vessel 28. Namely, the carbon nano material 13 is sealed by the matrix metallic material 29. Though a trace amount of oxygen remains in the heat resistant vessel 28, after being sealed with the matrix metallic material 29, there is no risk in which residual oxygen reaches the carbon nano material 13 or an Si-covered carbon nano material 25, and the risk of oxidation or the like is reduced.

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