To provide a vehicle with motive power capable of surely preventing a sudden forward falling when ascending and descending stairs.

This vehicle comprises a frame 1, a pair of right and left front crawler units 2 and 2 provided on the right and left side surfaces of the frame 1 so that the front end sides are vertically rockable, a pair of right and left rear crawler units 3 and 3 provided on the right and left side surfaces of the frame 1 so that the rear end sides are vertically rockable, and a drive means 4 for rotating the front crawler units 2 and 2 and/or the rear crawler units 3 and 3. This vehicle further comprises a front rocking means 6 for synchronously rocking the front crawler units 2 and 2 in the same direction and a rear rocking means 7 for synchronously rocking the rear crawler units 3 and 3 in the same direction.