PURPOSE: A manufacturing method of a composite material containing carbon system particles and copper is provided to improve the compatibility between the carbon system particles and cuprous oxide particles. CONSTITUTION: A manufacturing method of a composite material containing carbon system particles and copper comprises the following steps: obtaining a solution by dissolving a carbon polymer organic compound and a copper precursor and forming a mixture by mixing the solution with a dispersed solution including the carbon system particles dispersed in a first dispersion medium; forming composite particles with cuprous oxide particles attached to the surface of the carbon system particles by adding a first reducing agent; and sintering the composite particles in a non-oxide atmosphere.