PURPOSE: To facilitate insertion of a nipple into a hose, surely fasten the hose between the sleeve and the nipple after insertion, and prevent malfunction such as increase of steps of processes or end breakage.

CONSTITUTION: A hose fastening structure is made up of a connection part 1, a sleeve 2 extended from the connection part 1, a hose 3 inserted into the sleeve 2, and a nipple 4 inserted into a center hole of the hose. The nipple 4 is made of memory shape alloy. The nipple 4 is widened in its diameter, and the shape is memorized. The hose 3 is in press-contact to an inner peripheral wall of the sleeve 2 of the hose 3.