PROBLEM TO BE SOLVED: To provide an expansion device of a road bridge which can favorably prevent that a load which is locally concentrated is applied by diffusing the load when the load is applied from above to a bridge member such as a floor plate.SOLUTION: An expansion device 10 of a road bridge which is arranged at a connecting portion between bridge members composed of floor plates 108 or the like, and installed by using notched steps 18 which are formed at opposing positions of the connecting portion comprises: an expansion part main body 12 which is installed long along a joint gap 20; hang-out members 14 which are protrusively arranged while hanging out of the expansion part main body 12, aligned at prescribed intervals, and integrated with the bridge members 108 with concrete 22; and load diffusion means 16 which are connected to a plurality of the hang-out members 14, installed while spreading into a plane shape at a lower layer side of a plurality of the hang-out members 14, diffuse a load which is applied in a lower direction from a road face side, transmit the load to the bridge members 108, and are integrated with the bridge members 108 with the concrete 22.SELECTED DRAWING: Figure 1
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