A wheelchair that is not easy to lean back is used to solve the problem that the conventional wheelchair is easy to lean back on an uphill section and has poor safety. The system includes: a main frame body； two main wheels, which are coaxially mounted on two sides of the main frame body, and the shaft centers of the two main wheels pass through a first reference plane； and a power assist system having an inclined A lever is connected to an auxiliary wheel and the main frame body, a force application point of the inclined rod to the main frame body is located above the first reference plane, and the auxiliary wheel is closer to the rear end of the main frame body than the force application point.一種不易後傾的輪椅，用以解決習知輪椅在上坡路段易後傾而使用安全性不佳的問題。係包含：一主架體；二主輪，呈共軸地安裝在該主架體的二側，該二主輪的軸心由一第一基準面通過；及一動力輔助系統，具有一斜桿連接一輔助輪及該主架體，該斜桿對該主架體的一施力點位於該第一基準面之上，該輔助輪較該施力點鄰近該主架體的後端。
