PURPOSE: To enhance performance and durability of component parts of a combustion chamber, by constituting the component parts from silicon base non- oxide ceramics as base material, and the surfaces of the parts are converted into silicon oxide ceramics by heating at a high temperature, and a thin layer of a precious metal catalyst is provided.

CONSTITUTION: Upper and lower swirl chamber members 8, 9 as component parts of the combustion chamber are constituted of silicon base non-oxide ceramics such as silicon carbide ceramics, the surfaces defining a swirl chamber 7 and a jet 10 are converted into silicon oxide ceramics by heating at a high temperature, and the thin layer 11 of a precious metal catalyst such as platinum, rhodium or palladium is formed thereon by a sputtering method. Since the silicon oxide ceramics are lower in surface energy, more excellent in wettability and more compatible with precious metals as compared with silicon nitride ceramics and silicon carbide ceramics, the thin layer of the precious metal catalyst can be formed on the surface thereof with sufficient bond strength, and will not be exfoliated at an early period.