To provide a surface sheet seam structure capable of reliably waterproofing a bathroom floor in which a plurality of surface sheets are laid side by side without causing a construction error.SOLUTION: A seam member 14 is provided along a seam 13 between a first surface layer sheet 11 and a second surface layer sheet 12 laid adjacent to each other on a floor panel 2 of a bathroom. A receiving member 20 of the seam member 14 is arranged between facing end surfaces 11e and 12e of the surface layer sheets 11 and 12. A bottom plate portion 21 of the receiving member 20 is thinner than the surface layer sheets 11 and 12, and a receiving wall portion 22 projects upward from a central portion thereof. Sealing filling grooves 41 and 42 are formed between both side surfaces of the receiving wall portion 22 and the facing end surfaces 11e and 12e of the surface layer sheets 11 and 12, respectively. A front side member 30 is arranged on an upper side of the receiving member 20, a cover portion 31 is bridged between the upper surfaces of the surface layer sheets 11 and 12, and a fitting convex portion 33 is fitted into a fitting groove 23 of the receiving wall portion 22.SELECTED DRAWING: Figure 3
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