PURPOSE: To provide a riding maintenance machine traveling with a crawler, having a sheet for an operator on a frame, having an engine under the sheet, etc., capable of securing the maximum front visual range and simultaneously securing the large rear visual range, and improving the efficiency of the maintenance work.

CONSTITUTION: This riding maintenance machine travels with a crawler 20, has an operator sheet 14 on the frame 10, and has an engine under or behind the sheet 14. The crawler has a parallelogram on the side view, and a driving wheel 21 and a take-up wheel 23 are disposed at the acute angle parts of the parallelogram, respectively. Further, a jack mechanism for floating up the crawler 20 from the ground surface is preferably disposed in the frame 10.