A slurry sample was prepared by dispersing spherical micro-particles of poly( methyl methacrylate) (PMMA) in aqueous solution of polyvinyl alcohol (PVA), and a coated film sample was prepared by applying the slurry sample on a polyester sheet. The drying rate of the film sample was measured by a modified temperature change method. The effect on the drying rate of micro-particle concentration, defined as micro-particle volume/dried polymer volume, was examined in the range from 0.25 to 1.0, in which the porosity of the dried film was expected to be zero, and the effect of the micro-particle radius was also examined. During the period of decreasing drying rate, the drying rate was found to decrease with increasing micro-particle concentration and with decreasing micro-particle radius. Subsequently, the drying rate was almost constant, and the porosity was almost zero. The constant drying rate observed during the latter period was explained by a mass transfer model incorporating drying stress proposed by the authors in this study. The gloss on the surface of dried film was also measured and found to decrease with increasing micro-particle concentration, but to be little affected by the particle radius.