To provide a corrosionproof layer structure of a highly water-resistant and easily executable concrete structure and a corrosion protection method.

The corrosionproof layer structure of the concrete structure includes an epoxy resin hydraulic composition layer on a concrete body, a polyurethane resin hydraulic composition layer, and a polyurea resin layer, wherein the amine of the polyurea is an aromatic amine and the time becoming for the viscosity of the polyurea resin twice as much as its initial viscosity at 23C after is mixing is 5 min or longer and this corrosion protection method is treated.