The invention relates to a needle protective cover and a syringe including the needle protective cover. The syringe includes a cylinder and a needle, and the needle protective cover includes a set and a cover. The kit includes an inner peripheral wall and an inner thread section, defining a first end and a second end, and the radial dimension of the inner peripheral wall is gradually reduced from the first end to the second end.本創作關於一種針具護蓋及包括該針具護蓋之注射器，該注射器包括一筒體及一針具，該針具護蓋包括一套件及一蓋件。該套件包括一內周壁及一內螺紋段，定義一第一端及一第二端，該內周壁之徑向尺寸係由該第一端朝該第二端漸縮。
