| 摘要 |
An oxygen sensor as a gas sensor has a vent hole for taking an atmosphere into an outer sleeve in an outer sleeve cover for covering the outer sleeve from above and manufactured by rubber. A filter unit made by a tubular member enlarged in diameter on a predetermined boundary, a sheet-shaped filter having a water repellent property and an oil repellent property, and an O-ring is fitted and inserted into this vent hole. The upper end portion of a large diameter portion is folded by bending processing. Folding portion nips and supports the filter and the O-ring between the folding portion and a step portion formed between a large diameter portion and a small diameter portion. It is sufficient to set the size of a filter to same size as the vent hole. The filter can be attached to a predetermined position of the outer sleeve cover.
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