As for the machine with a wheel, moving up and down on stairs is weak. Until now, the author manufactured the walk machine which can move on the flat ground or stairs, when supporting the end of the walk machine by hand. The structure of the walk machine go up stairs using six legs ( one side is three legs), and moves on the flat ground using the tire. Now the author has manufactured the walk machine which can move on the flat ground and go up stairs without having the end of the walk machine. The author reports this manufacture process.