| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas sensor element in which an electrode material of an inner electrode can be reduced by making a lead part narrower than a detection part in a radial direction and the inner electrode is hardly exfoliated even when applied with cooling/heating cycles, and a manufacturing method thereof.SOLUTION: A gas sensor element 3 includes a solid electrolyte body 3s formed like a bottomed cylinder extending in a direction of an axial line O and having the front end closed, an inner electrode 50 provided on an inner surface of the solid electrolyte body, and an outer electrode 450 provided on an outer surface of the solid electrolyte body. The inner electrode has an inner detection part 51 located on the front end side and an inner lead part 52 extending from the inner detection part toward the rear end and being narrower than the inner detection part in a circumferential direction, and an angle &thetas; which is formed at a connection point C where a contour line g of the inner lead part and a rear edge 51e of the inner detection part are connected, on the outside in the circumferential direction of the inner lead part by the contour line of the inner lead part and a tangential line t of the rear edge of the inner detection part is an obtuse angle. |
