PURPOSE: To obtain a floor mat having a pattern corresponding to a number of collapsed resin particles having various diameters, by supplying thermoplastic synthetic resin particles containing particles having different particle diameter using a notched doctor blade, etc., dispersing the particles under vibration, and collapsing by pressing at a high temperature.

CONSTITUTION: Thermoplastic synthetic resin particles containing particles having small particle diameter and particles having large particle diameter are applied to the surface of a substrate using a notched doctor blade or an applicator having resin particles feeding ports with intervals in a manner to feed a number of resin particles on the surface of the substrate in the form of stripes. The substrate is vibrated to disperse the resin particles uniformly on the substrate surface. The substrate is heated and pressed to fuse the resin particle to the substrate and at the same time, to weld the resin particles with each other and to collapse the particles. Even resin particles having larger particle diameter than the gap between the lower end of the doctor blade or applicator and the substrate can be supplied by this process,and a floor mat having a large pattern caused by the collapse of large-sized resin particle can be produced.