It is a problem to detect methane without using a non-methane hydrocarbon remover in principle, and as a solution thereof, a combustion cylinder 103 having an exhaust port 104 in the upper portion and a sample gas inlet 5 in the lower portion thereof. And a burner 108 in the combustion cylinder 103, two electrodes 111 and 113 provided in the vicinity of the crater 108a of the burner 108, and these electrodes 111 and 113. It is assumed that a power source 117 connected to the air supply pipe 117 and an air pipe 28 and a fuel gas pipe 29 are connected to the fuel gas inlet 114 of the burner 108.
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