Including knee front surface (A), knee rear surface (B), thigh front surface (C), thigh rear surface (D), shin side front surface (E), and shin side rear surface (F) A knee supporter that includes a cylindrical supporter body and that has an elastic modulus in the axial direction when the cylindrical supporter body is extended by 80% in the axial direction, satisfies the following formulas (1) to (3). 0.7 ≦ Knee Rear Surface (B) / Knee Front Surface (A) Formula (1) 1 <；Thigh Front Surface (C) / Thigh Rear Surface (D) Formula (2) 1 <；Tibial Side Front part (E) / tibial rear part (F) Formula (3)膝前面部（Ａ）、膝後面部（Ｂ）、太腿側前面部（Ｃ）、太腿側後面部（Ｄ）、脛側前面部（Ｅ）、及び脛側後面部（Ｆ）を含む筒型のサポーター本体を備え、筒型のサポーター本体の軸方向に８０％伸長させたときの該軸方向の弾性率が、下記式（１）～下記式（３）を満たす膝用サポーター。 ０．７≦膝後面部（Ｂ）／膝前面部（Ａ） … 式（１） １＜太腿側前面部（Ｃ）／太腿側後面部（Ｄ） … 式（２） １＜脛側前面部（Ｅ）／脛側後面部（Ｆ） … 式（３）
