Patent ID: 7430894

Claim:
A gas sensor comprising: a sensor element formed extending in an axial direction and being to be exposed at a front end side to gas which is a measuring object; a metallic shell holding the sensor element; an outer sleeve connected, at its front end portion, with the metallic shell; a plurality of electrode output terminals which are in electrically conductive relationship with the sensor element; a plurality of lead wires connected to the electrode output terminals respectively; a separator accommodated in the outer sleeve and setting therein the electrode output terminals individually while insulating them from one another; and an elastic seal member having lead wire insertion holes through which the lead wires are inserted respectively, the elastic seal member being located in the outer sleeve closer to a rear end side than the separator, wherein the separator is held in the outer sleeve so that it is urged toward a rear end while being in contact with a front end surface of the elastic seal member and an outer circumferential surface of the separator is in noncontact with an inner circumferential surface of the outer sleeve.