A guarded medical winged needle assembly for safely and securely encasing a winged needle without any complicated operation, includes a cylindrical needle cover 1 having a forward section 2, a middle section 3 and a backward section 4, the middle section 3 having an opening 5 formed at a bottom thereof, the backward section 4 having a slit 7, anda winged needle 21 having a pair of wings 24 fitted to on both sides of a hub 23, a needle 22 provided before said hub 23 and a tube T fitted to a backward portion of said hub 23, andsaid winged needle 21 being slidably housed and protected in said needle cover 1, (A) an engaging member 27, 28 being fitted to said tube T, or (B) an engaging member 30 being fitted to a backward portion of said hub 23, said winged needle thereby being fixable when housed in said needle cover.