A foldable wheelchair includes a back support, a seat portion pivoted to the back support, a front leg portion pivoted to the seat portion, and two armrest bars pivoted to the back support. There are two first connecting rods pivotally arranged between the armrest bar and the seat portion, such that the seat portion can be pivotally rotated between a first position to be substantially perpendicular to the back support and a second position to be substantially parallel to the back support. The wheelchair further includes two second connecting rods pivotally connected between the front leg portion and the back support, and two extending arms respectively fixed to the two second connecting rods. When the seat portion is located at the first position, an auxiliary wheel of each extending arm is located at a rear side of each rear wheel. When the seat portion is located at the second position, each front wheel and each rear wheel are not aligned, and each auxiliary wheel is rotated to the front side of each rear wheel for supporting the wheelchair in standing.一種可收折的輪椅,包括一個背部支架,與背部支架樞接的一個座椅部,與座椅部樞接的一個前腳部,以及與背部支架樞接的兩支扶手桿,在各扶手桿與座椅部之間樞設兩支第一連桿,造成座椅部可在與背部支架成一角度(大約垂直)的第一位置以及大致上與背部支架平行的第二位置之間樞轉,輪椅進一步包括樞接在前腳部與背部支架之間的兩支第二連桿以及分別固定在兩支第二連桿上的兩支延伸臂,在座椅部位於第一位置時各延伸臂具有的輔助輪位於各後輪的後方,在座椅部位於第二位置時各前輪與各後輪不對齊,且各輔助輪樞轉至各後輪的前方,支撐輪椅站立。10‧‧‧輪椅20‧‧‧背部支架20A‧‧‧第一樞部20B‧‧‧第二樞部20C‧‧‧第三樞部22‧‧‧側桿23‧‧‧第一固定桿24‧‧‧第一端25‧‧‧第二固定桿26‧‧‧第二端27‧‧‧定位部28‧‧‧推把29‧‧‧定位孔32‧‧‧後輪34‧‧‧背靠件36‧‧‧座椅部38‧‧‧基桿39‧‧‧安裝槽40‧‧‧銜接板41‧‧‧彈簧42‧‧‧縱身段43‧‧‧閉鎖件44‧‧‧斜伸段46‧‧‧接管48‧‧‧擋片49‧‧‧樞軸50‧‧‧第一連桿52‧‧‧第一端54‧‧‧第二端56‧‧‧椅架58‧‧‧前端60‧‧‧後端62‧‧‧接桿63‧‧‧拉桿64‧‧‧卡鉤板66‧‧‧鉤端68‧‧‧樞接端70‧‧‧嵌槽71‧‧‧撥片72‧‧‧前腳部74‧‧‧橫段76‧‧‧側段78‧‧‧第一樞耳80‧‧‧第二樞耳82‧‧‧第二連桿84‧‧‧第一樞設端86‧‧‧第二樞設端88‧‧‧延伸臂90‧‧‧定位端92‧‧‧支撐端94‧‧‧輔助輪96‧‧‧輪架98‧‧‧前輪111‧‧‧扶手桿113‧‧‧轉接頭115‧‧‧樞接板117‧‧‧置腳架119‧‧‧踏板131‧‧‧椅板133‧‧‧上表面135‧‧‧下表面
