The present invention relates to a pen needle provided with a safety protection system, which utilizes a shuttlecock-shaped supporter blade of an elastic material to simplify the structure and reduce the number of parts to reduce the manufacturing process and size of the pen needle, thereby providing a less expensive, simpler and safer pen needle, in order to prevent the pen needle, which is a one-time consumable item to be inserted and fastened into a pen-type syringe in a screw-coupled manner, from being reused after a single use. Provided is a pen needle according to the present invention, which is configured to be inserted into a small cap through an upper surface through-hole of the small cap, when the depression of a push button for administration of an injection medicine is released after the push button for administration of the injection medicine is depressed and a needle is drawn outside the small cap through the upper surface through-hole of the small cap, so that the needle cannot be drawn to the outside of the small cap through the upper surface through-hole of the small-cap, the pen needle comprising: a small cap in which a top surface of a ring-shaped small cap is in contact with a small-cap cylindrical wall body； a wing-type support unit which is provided with a cylindrical needle fixing body insertion tube, includes a plurality of wing-type support wings along the rim of the needle fixing body insertion tube, is inserted into the small-cap cylindrical wall body, and is moved according to whether a push button for administration of the injection medicine is depressed； and a hub which has a needle fixing body to which the needle is inserted at the center thereof, the needle fixing body being inserted into the needle fixing body insertion tube.La présente invention concerne une aiguille pour stylo comportant un système de protection de sécurité, qui utilise une lame de support d'un matériau élastique en forme de volant de badminton afin de simplifier l
