A process for producing a thermoplastic resin molded product, comprising: a placement step of placing a thermoplastic resin particle composition 6A into a cavity 22 of a rubber die 2 made of a rubber material; a particle heating step of irradiating the thermoplastic resin particle composition 6A in the cavity 22 with electromagnetic waves having wavelengths ranging from 0.78 to 2 μm through the rubber die 2, thereby heating to melt the thermoplastic resin particle composition 6A; a filling step of filling a thermoplastic resin 6 in a molten state into a space 220 left in the cavity 22; and a cooling step of cooling a thermoplastic resin 6 in the cavity 22 thereby obtaining a thermoplastic resin molded product.