An adjustable back support frame is provided, including: a back support member, including a first joint portion, the first joint portion having a long slot and a fixed hole communicated with the long slot； a shoulder support member, including a connection portion and a second joint portion connected with the connection portion, the second joint portion having a plurality of through holes, the second joint portion movably inserted into the long slot to optionally move one of the through hole to correspond to the fixed hole； and an engaging member, swingably connected with the first joint portion, the engaging member disengageably engaging through the fixed hole and one of the through holes.本發明關於一種可調式背架，包括：一背支撐件，其包括一第一結合部，該第一結合部設有一長槽及一連通該長槽之固定孔；一肩支撐件，其包括一連接部及一連接該連接部之第二結合部，該第二結合部設有複數穿孔，該第二結合部可移動地插設於該長槽以選擇其中一該穿孔對應該固定孔；及一扣件，其可擺動地設於該第一結合部，該扣件可拆卸地穿扣該固定孔及其中一該穿孔。
