PURPOSE:To obtain stabilized wide-range combustion flame plasma and to deposit a diamond film high in flatness and adhesive strength at a high rate at the time of burning a diamond depositing compd. by providing a reflector at the tip of a combustion burner. CONSTITUTION:When a diamond depositing compd. such as gaseous acetylene is burned, the pressure of the atmosphere in a housing 1 is controlled, and a reflector 3 is fixed at the tip of a combustion burner 2. In this case, the diamond synthesizing gas is burned so that an incomplete combustion region is present, a substrate 4 to be deposited with diamond is set in the incomplete combustion region or in the region excited into a diamond depositing function close to the incomplete combustion region.
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