An environment recognition device (20) is provided with a first opening (20c1) through which a harness (20g) passes on a side surface of a frame (20c) below an environment recognition unit (20a). An upper base (10) below the frame (20c) is provided with a second opening (10b) through which the harness (20g) passes. A coupling mechanism (21) configured to couple the environment recognition unit (20a) and the upper base (10) supports the frame (20c) such that the frame (20c) is rotatable about an axis parallel to an upper surface of the upper base (10). A cover (21a) covers the first opening (20c1), the second opening (10b), and part of the harness (20g) extending between the first opening (20c1) and the second opening (10b).