Abstract: The protective cap for the needle of a hypodermic syringe is constituted by a hollow body of elongated shape which is open at one end and provided over its entire length with an opening for the introduction of the needle. On the opposite side, the protective cap has a flat bearing face in order to place the cap on a flat surface in a stable manner. Flexible strips serve as members for locking the needle-mounting sleeve against the inner wall of the cap after it has been introduced. The protective cap is intended to enclose the needle of a hypodermic syringe before and after use.