| 摘要 |
A cylindrical metal tube ( 3 ) accommodating therein a thermistor device ( 2 ), the electric characteristics of which change with temperature, is pushed into, or clamped and fixed to, a sheath portion ( 42 ) positioned on a flange ( 4 ) to the rear of a projection portion ( 41 ) of the flange ( 4 ), and is laser welded in a circumferential direction. A weld portion (L 1 ) formed to bridge the metal tube ( 3 ) and the sheath portion ( 42 ) of the flange ( 4 ) firmly fixes the metal tube ( 3 ) to the flange ( 4 ). In the temperature sensor ( 1 ) having this construction, the weld portion (L 1 ) between the metal tube ( 3 ) and the flange ( 4 ) is not exposed to a high temperature environment. Therefore, oxidation hardly occurs at the weld portion and reliability of air tightness to an exhaust gas can be improved.
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