| 摘要 |
A lead part (25) of a heater coil (22) is constituted of a single coil wound like a coil, and a bead part (24) is constituted of a coiled-coil formed by further winding the single coil like a coil. The bead part (24) is buried in a heat conductive layer (21), and a catalyst layer (23) is deposited on the surface of the heat conductive layer (21) to produce a detection element (2). Thus, the gas sensitivity and response speed of a contact combustion type gas sensor is enhanced. Furthermore, the zero point variation is suppressed by enhancing the impact resistance. When the opposite ends of the heater coil are secured to electrode pins, the opposite ends of the heater coil are welded to the electrode pins by resistance welding in a state where a platinum wire or the like is wound around a primary core wire, and then wet etching is carried out to dissolve the primary core wire while leaving the platinum wire or the like.
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