PURPOSE: To lessen impact by constructing the title device of a support member supporting a fixing member attached with a fender in a way of being capable of sliding back and forth and fixing the same to a structure body and a brittle breaking member interposed between the support member and the fixing member.

CONSTITUTION: The title device is constructed of a fender 1 made of elastic body such as rubber or the like, a fixing member 5 made of steel plate, a support member 10 made of steel plate and rivets 15 for shear breaking acting as brittle breaking members. When dynamic load exceeding breaking load of the rivets 15 is applied to the device by a floating body such as a ship or the like, the rivets 15 are broken making the fixing member 5 instantaneously slide toward a quaywall 16 for a stroke allowable for the sliding. Furthermore, the fender 1 recovers its displacement quantity from the quantity made by the sliding and absorbs kinetic energy of the ship by deformation made by regenerated reaction force. Thereby buffer operation of the device can be improved.