Polyvinyl alcohol resin, water-soluble film, extrusion-molded article, filament, nonwoven fabric, container, method for producing water-soluble film, and aqueous solution

A polyvinyl alcohol resin comprising, as a principal component, a modified polyvinyl alcohol comprising an N-vinylamide unit,

• wherein a ratio (N1/N2) of the number (N1) of 1-μm-size particles to the number (N2) of 2-μm-size particles comprised in 1 mL of a 2% by mass aqueous solution of the polyvinyl alcohol resin is 0.1 or more and 50 or less.