Problem to be solved: to provide a knee rehabilitation device that can be easily rehabilitated in a place other than the medical treatment site such as home, and can be treated even in an individual, in order to restore early function and not to increase medical expenses as much as possible.The knee rehabilitation device 1 comprises a soft plastic which is inflated and contracted by the supply and exhaust, and has a slanted side portion 4, a side wall portion 6, a bottom portion 6, a first connecting portion 7 for connecting the inclined portion 4 and the upper side portion 5, and a second connection portion 8 for connecting the bottom portion 6 and the oblique side portion 4, and the respective portions described above A plurality of columns of air chambers r communicating with each other are provided in four to eight, and adjacent air receiving chambers r in each of the above described sections 4 toA closed portion 10 is provided between the R in a state in which a portion of the communication port 9 is left so that the valley portion V is formed at the time of air accommodation, and there are provided air supply \/ discharge sections 11 and 11a provided with check valves, respectively.Diagram【課題】早期の機能回復のために、又、できるだけ医療費を嵩ませないためにも自宅等の医療現場以外の場所でもリハビリ可能で個人でも容易に取り扱えることができる膝リハビリテーション具を提供すること。 【解決手段】膝リハビリテーション具1は、給排気により膨張収縮する軟質プラスチックよりなり、斜辺部4と、垂辺部5と、底辺部6と、斜辺部4及び垂辺部5を接続する第1接続部7と、底辺部6及び斜辺部4を接続する第2接続部8とを備え、前記各部4~8には互いに連通する空気収容室Rが複数列設けられ、前記各部4~8において隣接する空気収容室R,R間には、空気収容時に谷部Vが形成されるよう一部に連通口9を残した状態で閉鎖部10が設けられており、さらに、前記空気収容室Rのいずれかに逆止弁付き給排気部11,11aが設けられている。【選択図】 図2