PROBLEM TO BE SOLVED: To provide a filling structure for a highway bridge expansion device that causes rain water and snow to hardly accumulate and that is excellent in durability.;SOLUTION: A first filling member 34 and a second filling member 36 have an elongated shape, both longitudinal ends of the members are mounted to an edge surface 2006, and a bellows-shaped part 1604 is located separately downward from the first filling member 34 and the second filling member 36 so that when rain or snow falls, rainwater or snow falls below a filling member 32. When a dimension of a concave-convex shaped clearance S in a bridge axial direction changes due to the changing of the seasons, a change in the shape of a bending part 3402 of the first filling member 34 and the second filling member 36 mainly absorbs the dimensional change of the clearance S without the first filling member 34 and the second filling member 36 being directly pulled in the longitudinal direction or directly compressed.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2019,JPO&INPIT
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