A chairback support structure includes: a back element (10) having a plurality of insertion holes (13)； a plurality of resilient bend plates (20) each having a bendable 5 portion (21), two insertion portions (22) extending from two ends of the bendable portion (21), respectively, and two abutting portions (23) disposed at two ends of the bendable portion (21), respectively, the two insertion portions (22) being insertable into the insertion holes (13) of the back element (10), and the two abutting portions (23) being adapted to abut against the back element (10)； and a pad (40) for covering the back 10 element (10) and the resilient bend plates (20).一種椅背支撐結構，包含有一背件，具有多個插片孔；多個彈性彎曲片，各具有一可彎曲部，以及兩插固部分別接於該可彎曲部兩端，以及兩抵止部位於該可彎曲部兩端；該兩插固部可插固於該背件的插片孔，該兩抵止部可抵止於該背件；以及一靠墊，蓋設於該背件與彈性彎曲片上。
