the present invention provides an adhesive for floor structure that can provide a floor structure inhibiting floor squeaks or joint gaps from occurring and that enables a floor finishing material to be peeled easily from a sub - floor material when repairing the floor finishing material . the adhesive for floor structure of the present invention contains a hydrolyzable silyl group - containing polyoxypropylene - based polymer , calcium carbonate , and a hollow filler . the adhesive for floor structure of the present invention can be used for adhesively integrating a floor finishing material 20 with a sub - floor material 30 laid on a floor base 1 .