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 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.
