Patent ID: 8413483

Claim:
A gas sensor comprising: a gas sensing element that senses a concentration of a specific gas contained in a gas to be measured; a housing that houses the gas sensing element such that the gas sensing element passes the housing therein; and an element cover secured to an end of the housing, wherein the element cover comprises an inner cover covering the gas sensing element and one or more outer covers disposed outside the inner cover, the at least one outer cover comprises an outer charge port that allows the gas to be introduced into the outer covers, the inner cover comprises an inner charge port that allows the gas to be introduced into the inner cover and an inner discharge port that discharges the gas to be measured to an outside of the gas sensor, the at least one outer cover includes one drain cover comprising a side opening functioning as the outer charge port and a discharge opening discharging the gas introduced into the drain cover, the side opening being formed through an approximately cylindrical side wall body, the discharge opening being formed through a bottom body formed on a tip end side of the side wall body, the inner charge port is formed closer to a base end than the side opening is, and the side opening is formed such that an opening direction directed from an outside of the drain cover to an inside of the drain cover has a directional component directed towards a tip end side in an axial direction of the gas sensor, wherein the side opening is integrally formed with the side wall body, and the drain cover has a recess formed at the side wall body by having the side wall body recessed towards a radially inside of the drain cover, wherein the side opening is formed adjacent to a tip end of the recess in the axial direction.