Ngk Insulators, Inc.

Yosuke Noritake

Kei Kosaka

Michiaki Isoda

Keita Kayano

A sensor element includes an element body, an upper connector electrode disposed on a first surface of the element body, and a protective layer that covers at least a front end-side part of the first surface. The protective layer includes a first specific protective layer having a thickness Tof 10 μm or less. The ratio T/Tof the thickness Tto the thickness Tof a front-side portion of the protective layer which faces the front end of the first specific protective layer is 1.0 or less.

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Vernon Hills, IL, United States of America

Yosuke Noritake