To provide an anti-fogging treating agent having excellent anti-fogging properties, and to provide an anti-fogging resin sheet.

The anti-fogging surface-treating agent is constituted of (A) a fatty acid amide (with the proviso that a poly(oxyethylene) fatty acid amide is excluded) and (B) a hydrophilic polymer (with the proviso that a polyoxyethylene-polyoxypropylene block copolymer is excluded). The fatty acid amide (A) can be an amide of an 8-30C fatty acid with amines. The hydrophilic polymer (B) can be a polyoxyethylene, a vinylpyrrolidone-based polymer, a vinyl alcohol-based polymer, a cellulose ether, alginic acid or a salt thereof. The ratio (by weight) (A/B) of the fatty acid amide (A) to the hydrophilic polymer (B) can be about (1/99) to (80/20). The anti-fogging resin sheet can be obtained by forming an anti-fogging layer constituted of the surface-treating agent at least on one surface of a resin sheet.

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