To provide a rubber undulating dam body having a sufficient bonding strength suitable for use of a rubber-made undulating weir having a weir height exceeding 1.5 m and having fins useful for vibration prevention measures and damage prevention during lodging .SOLUTION: A plurality of sets of rubber sheet laminates 2 having joint portions in the axial direction are provided, and in each set of rubber sheet laminates, rubber sheets 21 to 25 having the same shape are shifted by a predetermined amount in the axial direction and laminated , And the axial stepwise portion 4 in which the rubber sheets of the respective layers are shifted by a predetermined amount is provided at the end portion in the axial direction and the joined portions of the adjacent rubber sheet laminate are axially formed in the axial step-The protruding faces 211 to 251 of the rubber sheet of each layer which are displaced by a predetermined amount along the direction and the protruding faces of the rubber sheets of the other layers are compressed and the outermost rubber sheets are flush with each other and the rubber sheet In the laminate, the unvulcanized joined portions are vulcanized and bonded together and the fins provided along the axial direction of the rubber sheet laminate are bonded to each other in an unvulcanized state of the fin bonded portion and vulcanized Are joined.(FIG.
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