An endoscope cover mounted in a state of being locked to a convex locking portion of a distal end configuration portion of an endoscope is mounted on the distal end configuration portion along a longitudinal axis, and includes a cover body having an annular portion. A concave locking portion that is provided on the cover main body and that is locked to the convex locking portion of the tip configuration portion, and a portion that includes a proximal end of the annular portion, and When the cover body is rotated in the circumferential direction with respect to the longitudinal axis, the convex locking portion is disposed when the locking of the convex locking portion with respect to the concave locking portion is released. And a groove.内視鏡の先端構成部の凸状係止部に係止された状態に装着される内視鏡用カバーは、前記先端構成部に長手軸に沿って装着され、環状部を有するカバー本体と、前記カバー本体に設けられ、前記先端構成部の前記凸状係止部に係止する凹状係止部と、前記環状部の基端を含む部分に設けられるとともに、前記先端構成部に対して前記カバー本体を前記長手軸に対して周方向に回動させたときに前記凹状係止部に対する前記凸状係止部の係止が解除される際に前記凸状係止部が配置される溝とを有する。
