PROBLEM TO BE SOLVED: To realize a girder deflection reduction device capable of reducing girder deflection of its bridge girder in response to a change in acting force to the bridge girder.SOLUTION: A girder deflection reduction device 100 reduces girder deflection of a bridge girder 20, by changing a height position of an end part 31 of a net-like member 30 by a height adjustment mechanism part 40, when the girder deflection of the bridge girder 20 increases by changing acting force to the bridge girder 20 from a traveling railroad, since the bridge girder 20 can be made not to cause natural vibration by the acting force from the traveling railroad, by adjusting a vertical spring constant Kv for supporting the bridge girder 20 by the net-like member 30 to a suitable value, by changing the height position of the end part 31 of the net-like member 30 by the height adjustment mechanism part 40.SELECTED DRAWING: Figure 1
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