Abstract: A gas sensor (1) including: a sensor element (21) having an electrode pad (24); a metal terminal (75) electrically connected to the electrode pad via a contact portion C1; and a separator (91) retaining the metal terminal, wherein the metal terminal includes a stopper portion (75p) extending in a direction crossing the axial-line 0 direction, and where, in a pair of one of an electrode pad (241) and one of a metal terminal (751) connected thereto, as seen along a widthwise direction of the sensor element, an end of the one electrode pad that is closest to one inner surface 91si of the separator is defined as a pad end, a distance between the pad end and the contact portion is defined as DA, and a distance between the one inner surface of the separator and a distal end of the stopper portion is defined as DB, DA>DB is satisfied.

Abstract: A gas sensor (1) including: a sensor element (5) having an electrode pad (31, 32, 34, 35); a metallic terminal member (41) electrically connected to the electrode pad; and a lead wire (37) electrically connected to the metallic terminal member. The metallic terminal member has a forward-end-side terminal portion (43) which comes into contact with the electrode pad and a rear-end-side terminal portion (45) which is connected to the lead wire. The forward-end-side terminal portion has a bent portion (43d), and an element contact portion (43e) which comes into contact with the electrode pad. The rear-end-side terminal portion has a crimp terminal portion (45a) which forms a tube or a part of a tube, surrounds a conductor (37a) of the lead wire, and fixedly holds the conductor when crimped. Further, the maximum thickness t1 of the bent portion is greater than a maximum thickness t2 of the crimp terminal portion.