The new model provides a seat which can change the support angle.Mainly including a base frame,A main support which can be displaced between the normal position and the reclining position relative to the base frame.And a crus support body which can be deflected relative to the main support body；The main support body has a chair seat part and a chair back which are relatively fixed.There are hip support surface and back support surface respectively.The lower leg support body is provided with a lower leg support surface；At least one linkage mechanism is arranged between the main support body and the lower leg support body.By the said linkage mechanism,At present, when the main support body presents the aforementioned normal posture,The angle between the lower leg support surface and the hip support surface is relatively small.When the main support body is in the above-mentioned reclining position,The angle between the lower leg support surface and the hip support surface is relatively large.本新型提供一種可改變支撐角度的座椅，主要包含一基架、一可相對於基架在平常姿勢與仰躺姿勢之間位移的主支撐體，以及一可相對於主支撐體偏轉的小腿支撐體；前述主支撐體具有相對固定的一椅座部及一椅背部，分別設有臀部支撐面及背部支撐面，前述小腿支撐體則設有小腿支撐面；前述主支撐體與前述小腿支撐體之間設有至少一連動機構，藉由前述連動機構，當前述主支撐體呈現前述平常姿勢時，前述小腿支撐面與前述臀部支撐面的夾角相對較小，當前述主支撐體呈現前述仰躺姿勢時，前述小腿支撐面與前述臀部支撐面的夾角相對較大。
