| 摘要 |
A circuit section of a NOx sensor has an output base including a pedestal portion which projects from a middle part of a support surface of a base portion. A circuit board on which a storage medium storing individual information of the NOx sensor is mounted is arranged on a mount surface of the pedestal portion. The circuit section has a seal portion which is arranged above the support surface of the base portion, and which covers the circuit board from upper and lateral sides, thereby watertightly sealing the circuit board. The seal portion has an enclose portion which, in a state where the enclose portion protrudes from a peripheral edge of the support surface to a second circumferential side surface of the base portion, encloses the base portion along the peripheral edge.
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