Abstract: The present invention relates to an improved structure for key chain, comprising a main body having a thread at the upper end to enable it to be screwed onto the bottom end of a fixed seat, and the main body further having a chamber therein for receiving a disk spring and a top ring that is inserted onto the main body, and the disk spring is held with a conical body on the bottom of the top ring, and a key fastener held by the disk spring is then inserted. When the key fastener is intended for removal, pushing up the top ring will cause the conical body on the bottom of the top ring to prop open the sheet cones of the disk spring, and the key fastener can be removed.