| 摘要 |
A gas sensor (100) comprising:a sensor element (110); an inner protective cover (130) having a bottomed cylindrical shape, the inner protective cover having at least one first inner gas hole (134a) and at least one second inner gas hole (138a) formed therein and covering a free end of the sensor element; and an outer protective cover (140) having a bottomed cylindrical shape, the outer protective cover having a plurality of outer gas holes (144a,146a) formed therein and covering the inner protective cover; wherein the first inner gas hole (134a) is located so as to be closer to a base end of the sensor element than the second inner gas hole (138a), and wherein a ratio A2/A1 defined by a ratio of an opening area A1 per first inner gas hole (134a) and an opening area A2 per second inner gas hole (138a) is higher than or equal to 0.9 and lower than or equal to 3.8. Accordingly, adhesion of water to the sensor element (110) can be sufficiently prevented. |
