A mobility aid comprising a wheelchair device and a walking device detachably coupled to the wheelchair device. The wheelchair device comprises two spaced apart frame units, a loading unit connected between the two frame units, two rotating units respectively disposed on the two frame units, and a pivoting unit between the two frame units. An auxiliary supporting unit, the two rotating unit and the auxiliary supporting unit form a three-point support on a plane. Both the wheelchair device and the walking device can be deployed and stored. By the arrangement of the auxiliary supporting unit, a three-point support is formed with the two rotating units, thereby effectively avoiding the possibility that the wheelchair device is tilted backward, and the walking device is detachably coupled to the wheelchair device, and the wheelchair is Both the device and the walking device can be laterally deployed and folded separately.一種行動輔具，包含一輪椅裝置，及一可拆離地結合於該輪椅裝置上的助行裝置。該輪椅裝置包括二間隔設置的框架單元、一連接於該二框架單元之間的乘載單元、二分別設置於該二框架單元上的轉動單元，及一樞設於該二框架單元之間的輔助支撐單元，該二轉動單元與該輔助支撐單元於一平面形成三點支撐。該輪椅裝置與該助行裝置皆能進行展開與收納。藉由該輔助支撐單元的設置，與該二轉動單元形成三點支撐，有效避免該輪椅裝置向後傾倒的可能性，而該助行裝置是可拆離地結合於該輪椅裝置上，且該輪椅裝置與該助行裝置皆能單獨進行橫向展開與收折。
