A blind rivet having sealing and water-tightness features. The blind rivet is fastenable to a member having an opening and includes a rivet body and mandrel. The rivet body has a flange having a large diameter, a taper portion which is adjacent the flange and a sleeve which extends along the axial direction from the taper portion. A hole having a bottom is formed from the surface of the flange to the bottom of the sleeve. The mandrel has a head. The head of the mandrel is disposed at the bottom portion of the hole. A thick portion is formed at a portion of the sleeve, and thus the head is irremovably held in the hole. The mandrel is pulled, the sleeve is enlarged, and a substrate is sealed between the enlarged portion and the flange. A sealing structure using the blind rivet is also provided.