Provided is a moving unit that enables a movable body to be smoothly moved along guide tracks for guiding the movable body across joints between a plurality of track rails arranged in series so as to serve as the guide tracks. The moving unit includes: the pair of guide tracks laid in parallel to each other; a plurality of moving blocks being two or more moving blocks assembled to each of the guide tracks and being freely movable along the guide tracks; and the movable body fixed to the moving blocks. The track rails arranged in series serve as the guide tracks, and each have a guide surface formed along a longitudinal direction of each of the track rails. The moving blocks each include contact elements configured to travel on the guide surface while passing across joint clearances each being formed between the track rails arranged in series.