Exhaust gas recirculation sensor

An exhaust gas recirculation sensor comprising:

• an operating shaft movable linearly in the axial direction;
• a bearing portion for guiding movement of the operating shaft;
• a movable member movable linearly by the operating shaft;
• a spring member for returning movement of the movable member and biasing the movable member so as to resiliently contact the movable member onto the operating shaft;
• a case for guiding movement of the movable member;
• and
• detection means operated by movement of the movable member, wherein
• the operating shaft is provided in its rear portion with a convex portion protruding from a shaft portion in the direction orthogonal to the axial direction,
• the bearing portion is provided with a concave portion connected to a hole through which the shaft portion is inserted and allowing the convex portion to be inserted therethrough in the axial direction, and
• the convex portion protruding from the rear end of the bearing portion is retained to the rear end of the bearing portion other than the concave portion.