To provide the pin connecting structure of a steel-framed member, in which stable damping-force characteristics can be obtained by generating approximately constant frictional-resistance moment at all times even when a slip is repeated and abrasion is generated in a pin connecting section, to which revolving torque is input.

A pin connecting structure of a steel-framed member has a pair of outside plates 10, 12 and an intermediate plate 14 pinched between these outside plates. The outside plates and the intermediate plate are projected integrally from one and the other of the mutually joined steel-framed members respectively in a building frame. The outside plates 10, 12 and the intermediate plate 14 are superposed mutually, and friction materials 16 formed of a composite friction material are interposed among each outside plate and intermediate plate. A high strength bolt 18 is penetrated through the outside plates 10, 12 and the intermediate plate 14, and a nut 20 is clamped to the bolt 18 and specified axial force is added. A relative rotation is permitted centering around the high strength bolt 18 in the outside plates 10, 12 and the intermediate plate 14. A belleville spring 30 is installed as an urging means pushing the outside plates 10, 12, the friction materials 16 and the intermediate plate, and frictional force is stabilized.