Patent ID: 6953031

Claim:
An EGR sensor comprising: a linearly and axially movable actuating shaft; a slider driven by the actuating shaft; a substrate having a plurality of external lead-out terminals and electrode and having a slider slidable thereon; and a casing having an insertion hole through which the actuating shaft passes provided therein and having a bearing for guiding the movement of the actuating shaft and a receiving portion for receiving the substrate and the slider, wherein, when the casing is attached, the bearing is located downwardly, wherein a communicating passage comprising a groove or a hole is provided at the side of the bearing, the communicating passage being located lower than a position where the external lead-out terminals or electrodes of the substrate received in the receiving portion are attached, and the communicating passage leading to the insertion hole from the inside of the receiving portion, and wherein the moisture stagnated in the receiving portion is drained through the communicating passage to the outside.