Patent ID: 8032954

Claim:
A coupling member comprising a circular cylindrically-shaped elastic deforming portion that, when it is extendedly located at an inside of a mounting hole formed on an installation portion at a rear portion of a toilet bowl via a predetermined member at a side of a toilet seat device with warm-water sprays, is used for coupling it to the toilet bowl so as to be positioned inside the mounting hole, a resin-made washer that is located on the predetermined member and on which an upper end portion of the circular cylindrically-shaped elastic deforming portion is secured via a hole formed on the predetermined member, a bolt that is rotatably inserted into the resin-made washer and the circular cylindrically-shaped elastic deforming portion and inserted into the circular cylindrically-shaped elastic deforming portion and that has a threaded portion formed on a lower side thereof and a stopper portion formed on an upper side of the threaded portion adjacent thereto in addition, and a nut that is provided on a lower side of the circular cylindrically-shaped elastic deforming portion and screwed on the threaded portion and that moves in an upward direction by a rotational operation in one direction from an upper side of the bolt so as to enlarge the circular cylindrically-shaped elastic deforming portion in a radial direction, wherein the circular cylindrically-shaped elastic deforming portion enlarged in the radial direction is elastically engaged with an inner peripheral surface of the mounting hole, and wherein the circular cylindrically-shaped elastic deforming portion is sealingly engaged with the inner surface of the mounting hole when the nut is screwed and moved on the threaded portion of the bolt so as to be engaged with the stopper portion.