To provide an electric wheelchair that can surely raise and lower a stair without contacting a corner of a staircase in a state where a seat is always kept horizontal.SOLUTION: A center shaft 4 of a wheel 6a is provided on one side of a crankshaft 3, and the crankshaft is rotated by a prime mover unit to eccentrically rotate the wheels to move up and down stairs. Further, a wheel drive shaft 1 is passed through a hole drilled in the other side of the crankshaft, a wheel drive spur gear 2 is provided at the tip of the wheel drive shaft, and a wheel gear 5 attached to the wheel is rotated to run Configure as possible. Two of this configuration are provided in line symmetrical positions in one unit, and four units are provided in front, rear, left and right. Each of the left and right units is connected with a connecting material, and the front and rear units are connected to each other by the connecting members 11, 12 and the shafts 9, 10, 21, 22. A parallel link mechanism is formed by detecting the signal of the inclination sensor 18, and the electric actuator 15 By operating the parallel link mechanism by extending and retracting, the seat 26 is held horizontally.BACKGROUND OF THE INVENTION【課題】常に座席が水平に保たれた状態で、階段の角に接触せずに階段を確実に上り下り出来る電動車椅子を提供する。【解決手段】クランク軸3の一方に車輪6aの中心軸4を設け、クランク軸を原動ユニットで回転させ車輪を偏芯回転させる事で階段を上り下りする。更に、前記クランク軸のもう一方に開けられた穴に車輪駆動軸1を通し、該車輪駆動軸の先端に車輪駆動平歯車2が設けられ、車輪に取り付けられた車輪歯車5を回転させて走行出来るように構成する。この構成を1ユニットに線対称な位置に2個設け、このユニットを前後左右に4個設ける。左右の各ユニットは連結材で連結され、前後のユニットは連結材11、12と軸9、10、21、22によって平行リンク機構が構成され、傾斜センサー18の信号を検出して電動アクチュエータ15を伸縮させる事によって並行リンク機構を動作させ、座席26を水平に保持する。【選択図】図1
