| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas sensor having an insulator having excellent strength, capable of introducing sufficiently reference gas into a reference gas chamber. SOLUTION: An insulator 3 having a first metal cover and a second metal cover 12 arranged on its circumference, and a through hole 30 formed on the inner circumferential side of the first metal cover is arranged. The insulator 3 is formed so as to have a roughly circular section, and a reference gas passage part 35 for guiding the reference gas 8 taken from a first air hole 110 and a second air hole 120 into the reference gas chamber is formed on the circumferential surface 311. |
