A wheelchair device with a side warning includes a riding unit and a warning unit. The riding unit includes a riding body, two wheel shafts disposed on the riding body, and two wheel bodies disposed on the two wheel shafts, and the two wheel bodies rotate relative to the two wheel shafts. The warning unit includes two light output modules arranged on the two axles, and the two light output modules respectively project two warning lines to the ground. The two warning lines can prevent people around the wheelchair from approaching, and prevent collisions with people around the wheelchair when the wheelchair turns.一種具有側邊警示的輪椅裝置，包含一乘坐單元，及一警示單元。該乘坐單元包括一乘坐體、二設置於該乘坐體之輪軸，及二設置於該二輪軸之輪體，該二輪體相對該二輪軸轉動。該警示單元包括二分設於該二輪軸之光線輸出模組，該二光線輸出模組分別對地面投射出二警示線。該二警示線可以避免該輪椅周遭之人員接近，防止該輪椅轉彎時與周遭之人員發生碰撞。
