To provide a thermoplastic resin particle composition which can produce a thermoplastic resin molding which, when electromagnetic wave irradiation molding is carried out, performs smooth packing of thermoplastic resin particles into a cavity, can prevent the occurrence of faults such as burning, and is excellent in quality including shape, appearance, and surface accuracy and mechanical strength, the thermoplastic resin molding using the composition, a method for producing the molding.

The thermoplastic resin particle composition 6A is used in a process in which it is packed in the cavity 22 of a rubber mold 2 made of a rubber material and heated/melted by being irradiated with electromagnetic waves including a wavelength domain of 0.78-2 μm through the rubber mold 2. The thermoplastic resin particle composition 6A contains 0.1-20 mass% of small thermoplastic resin particles 62 1-100 μm in particle size and large thermoplastic resin particles 61 of 200-3,000 μm in particle size as the residual portion.