To provide a structure fixing structure of a sheet waterproofing floor, which enables the structure to be easily installed on a deck roof and a balcony, employing the sheet waterproofing floor of an existing house building.

In the sheet waterproofing floor 1, a disk plate 11 is fixed onto a substrate surface 12; and a waterproof sheet 13 covering the substrate surface 12 is bonded via the disk plate 11. Structurally, the structure 3 is installed on the sheet waterproofing floor 1. In the structure fixing structure of the sheet waterproofing floor 1, a bolt 22 is elongated from a steel base 21; an anchor member 2 is formed on the base 21 portion in such a manner as to be coated with a resin 23 capable of adhering to the waterproof sheet 13; the base 21 portion of the anchor member 2 is bonded onto the waterproof sheet 13 in the position of the disk plate 11 of the sheet waterproofing floor 1; and the structure 3 is fixed via the bolt 22 of the anchor member 2.

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