Abstract: A sensor device is configured to be penetrated by a shaft as a target to be detected. The sensor device includes a housing that includes a harness draw-out portion, and a sensor positioned in the housing. The sensor includes a sensor body and a harness to be drawn out of the sensor body via the harness draw-out portion. The housing includes a housing body that has an opening portion, and a cover that closes the opening portion. The harness draw-out portion includes a first draw-out portion provided in a peripheral wall of the housing body, and a second draw-out portion provided in a peripheral wall of the cover. The first draw-out portion and the second draw-out portion are configured to sandwich the entire circumference of a corresponding portion of the harness in a compressing manner.