To provide a foundation structure capable of improving durability of a connecting member, in the foundation structure for connecting a foundation arranged at an interval by the connecting member.

This foundation structure of a structure has a trough side foundation 32 and a crest side foundation 33 being an anti-trough side foundation arranged at an interval from this trough side foundation 32; and has the connecting member 51 for connecting the trough side foundation 32 and the crest side foundation 33, and a moving connecting means 52 capable of moving an end part 51T of the connecting member 51 by a predetermined quantity in the opposite side direction of the trough side foundation 32 connected with the connecting member 51. Even if the lower connecting member 51 deflects by receiving a repetitive load, since the connecting member 51 can move by a dimension K being the predetermined quantity by the moving connecting means 52, both side foundations 32 and 32 are not pulled to the road center side, and unreasonable force is not applied to a bearing power transmitting member 54 and a support receiving part 55, and the connecting member 51 is not cut by elongation.