A foldable wheelchair includes a support unit. The support unit includes a first side frame and a second side frame arranged at intervals, and a moveable skeleton disposed between the first side frame and the second side frame. Each of the first and second side frames includes a front end, a rear end, a top rod disposed between the front end and the rear end, and a storage slot downwardly recessed from the top rod and extended in a direction from the rear end to the front end. The top rods are all provided with fiber-reinforced composite material. The moveable skeleton includes a first main rod capable of abutting against the storage slot of the first side frame, and a second main rod capable of abutting against the storage slot of the second side frame, thereby facilitating to lower the overall gravity center of this invention and thus provide a relatively high safety.一種折疊輪椅,包含一支撐單元。該支撐單元包括呈間隔設置的一第一側架與一第二側架,及一介於該第一、第二側架之間的活動骨架。該第一、第二側架分別具有一前端、一後端、一介於該前、後端之間的頂桿,及一自該頂桿朝下凹設且自該後端朝該前端的方向延伸的收納槽。該等頂桿均具有纖維強化複合材料。該活動骨架具有一能抵靠於該第一側架的該收納槽的第一主桿,及一能抵靠於該第二側架的該收納槽的第二主桿。藉此,能有助於降低本發明整體重心且較具安全性。2‧‧‧第一側架23‧‧‧頂桿231‧‧‧收納槽24‧‧‧前桿25‧‧‧底桿26‧‧‧主框桿261‧‧‧下樞部262‧‧‧中樞部3‧‧‧第二側架33‧‧‧頂桿331‧‧‧收納槽34‧‧‧前桿35‧‧‧底桿36‧‧‧主框桿361‧‧‧下樞部362‧‧‧中樞部4‧‧‧活動骨架411‧‧‧第一主桿421‧‧‧第二主桿91‧‧‧支撐單元92‧‧‧前導輪93‧‧‧主轉輪94‧‧‧座椅單元95‧‧‧踏板
