To provide a sensor that can be downsized in order to ensure a stroke of a moving member when the sensor is mounted on a track member, and a movement guide device including the sensor. A sensor that is attached to a movement guide device having a track member extending in a longitudinal direction and a moving member attached to the track member in such a manner that the moving member is movable in the longitudinal direction includes: a housing that houses a sensor substrate; a shielded cable connected to the sensor substrate; and a cable bushing that holds and secures the shielded cable to the housing. The cable bushing has a conduction hole that allows the housing and the shielded cable to be electrically connected to each other, and the housing has a conduction part that can be inserted into the conduction hole.