External-injury waterproof protector, of long service life as a product. The structure of the limb-insertion opening enables completely shielding out water to protect an injured area. The protector has a flexible pouch body composed of a waterproofing material, with a mouth at either one or both ends, and an extensible/contractible annular constriction component hermetically and adhesively attached to the one or both pouch-body end(s). The annular constriction component is furnished with a tube portion formed to enable covering a portion of the four human limbs in a watertight state, and a brim portion formed projecting radially outward from a mouth edge of the tube portion. The tube portion favorably is formed at a narrower diameter than that of the other end of the pouch body. The brim portion arcuately slopes gently in a flaring form, lending the mouth of the annular constriction component an arcuate sloping surface.
