To provide an impregnated paper free from formaldehyde being the cause of sick building syndrome, exhibiting excellent dimensional stability when absorbing water, and having excellent impact resistance and interlaminar strength.

The impregnated paper for a floor material, formed by coating or impregnating a coating liquid at least containing a thermoplastic resin on or into an impregnation base paper is obtained by adding 5-30 mass% of an inorganic filler based on a raw material pulp, and 0.1-5 mass% of a silane coupling agent based on the inorganic filler to the inside of the impregnation base paper, and using a butadiene-based latex resin or an acrylic latex resin as the thermoplastic resin.