To dispense with raising floor for a seat in a front and side part, by providing an intermediate tilting roof for smoothly connecting a front lower roof and a rear higher roof raised proportionally to the height of an intermediate step, and both right and left ends of the front lower roof, the intermediate tilting roof, and the rear higher roof.

Both right and left ends of a front lower roof 6, a intermediate tilting roof 8, and a rear higher roof 7 are respectively constituted on a first height vertical frame 9, and the upper edges of a front portion side window 10 and a rear portion side window 11 are respectively added. The lower edge of the rear portion side window 11 is placed on a second height rear vertical frame 12. The lower edge of the front portion side window 10 is placed on a third height front vertical frame 13. When putting on/off of a wheel-chair user is considered, an electric slope plate is provided in a putting on/off opening F in an intermediate part, and a single person seat 19 of right side 5 legs on a no-step floor C is a folding type, or a wheelchair fixing space for two wheel- chairs can be provided as two sets of balanced-lever seats that is for three persons and is vertically placed.