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特許 権利維持 PROBLEM TO BE SOLVED: To provide an inexpensive novel type hydrogen detection element of simple structure, which detects accurately a hydrogen concentration even in gas such as H<SB>2</SB>O, CO, CH<SB>4</SB>, CO<SB>2</SB>, and also even in water. ; SOLUTION: The hydrogen detection element is provided with a sensitive part 1 and a detecting part 2 for detecting an electric resistance change in the sensitive part 1.