Gas sensor

A gas sensor comprising:

• a gas sensor element for measuring a concentration of a specific gas contained in a measurement gas;
• a housing through which said gas sensor element is inserted in a longitudinal direction of said gas sensor;
• and
• an element cover fixed to a front end portion of said housing;
• said element cover including an inner cover and an outer cover located around said inner cover,
• said outer cover being formed with a plurality of outer openings at a side surface thereof, and including a front end portion formed with a discharge opening, said discharge opening being located more closely to a front end side of said gas sensor than said outer openings,
• said inner cover being formed with a plurality of inner openings at a side surface thereof, said inner openings being located more closely to said front end side of said gas sensor than said outer openings,
• an opening direction of each of said inner openings extending from an inner side to an outer side of said inner cover having a direction component extending in said longitudinal direction towards a base end side of said gas sensor,
• wherein, when a clearance between said outer and inner covers at a longitudinal position of said outer openings is A, and an inner diameter of said outer cover at said longitudinal position is B, a ratio of A/B is equal to or larger than a predetermined value.