Provide a needle cover that is easy to stretch smoothly. The injection needle cover 30 includes a base portion 32, a base hinge 34, a connection location insertion space forming portion 36, a connecting hinge 38, and an injection needle surrounding portion 40. The injection needle surrounding part 40 includes a pair of base side wall parts 60, a cylinder part 62, a pair of tip side wall parts 64, an injection needle contact part 66, a hooking part 68, and a needle tip fixing part 70. Yes. The injection needle contact portion 66 is disposed at a position that becomes a boundary with the in-cylinder space 82 in the base-side axial space 80. The injection needle contact portion 66 has a force receiving portion 100 and a connecting portion 102. The force receiving portion 100 receives a force from the injection needle 24 when it contacts the injection needle 24. The force receiving portion 100 has an easy sliding portion 112. The easy sliding portion 112 is disposed in a region adjacent to the injection needle. The easy sliding portion slides easily along the injection needle 24 as compared to the case where the edge 114 slides along the injection needle 24.スムーズに伸長しやすい注射針カバーを提供する。 注射針カバー３０は、ベース部３２と、ベースヒンジ３４と、接続箇所嵌入空間形成部３６と、連結ヒンジ３８と、注射針包囲部４０とを備える。注射針包囲部４０は、ベース側壁部６０の対と、筒部６２と、先端側壁部６４の対と、注射針接触部６６と、引掛部６８と、針先端固定部７０とを有している。注射針接触部６６は、ベース側軸状空間８０のうち筒内空間８２との境界となる位置に配置される。注射針接触部６６は、受力部１００と、連結部１０２とを有している。受力部１００は、注射針２４に接触すると注射針２４から力を受ける。受力部１００は容易滑走部１１２を有する。容易滑走部１１２は注射針隣接領域に配置される。容易滑走部は、エッジ１１４が注射針２４に沿って滑る場合に比べて注射針２４に沿って容易に滑る。
