An object of the present invention is to make available a waterproof protector for external injuries, of long lifespan as a product, that by improving the structure of the opening through which an arm or leg is inserted enables completely shielding out water to protect an injured area. An external-injury waterproof protector 1 involving the present invention is an external-injury waterproof protector furnished with a flexible pouch body 10 composed of a waterproofing material and having a mouth at either one end or both ends, and an extensible/contractible annular constriction component 20 hermetically and adhesively attached to either the one end or to both ends of the pouch body 10, characterized in that the annular constriction component 20 is furnished with a tube portion 21 formed so as to enable covering a portion of the four human limbs in a watertight state, and a brim portion 22 formed projecting radially outward from a mouth edge of the tube portion 21. The tube portion 21 favorably is formed at a narrower diameter than that of the other end of the pouch body 10. Further, the brim portion 22 arcuately slopes gently in a flaring form, whereby the mouth 24 of the annular constriction component 20 is furnished with an arcuate sloping surface 212.
