A method for producing a toy, in particular a toy car, wherein said toy comprises: - a supporting body (42; 162); - a number of wheels (60; 60') rotatably mounted on said supporting body (42; 162), about respective axes of rotation; said method being characterized in that it comprises the following steps: - providing a moulding assembly (20; 20') for carrying out a process of injection moulding; - setting said moulding assembly (20, 20') in a first configuration in which a first moulding cavity or plurality of moulding cavities (300; 300') is defined for forming said supporting body (42; 162) or said number of wheels (60; 60'); - carrying out injection moulding of said supporting body (42; 162) or of said number of wheels (60; 60'), within said first moulding cavity or cavities (300; 300'), via a first plastic material; - setting said moulding assembly (20; 20') in a second configuration, defined in which are/is second moulding cavities or a second moulding cavity (400; 400') for producing said number of wheels (60; 60') or said supporting body (42; 162) on said supporting body (42; 162) or said number of wheels (60; 60'); - carrying out injection moulding of said number of wheels (60; 60') or of said supporting body (42; 162) on said supporting body (42; 162) or on said number of wheels (60; 60'), within said second moulding cavities or said second moulding cavity (400; 400'), via a second plastic material, wherein said first moulding cavity or cavities (300; 300') is/are configured for providing in said supporting body (42; 162) or in said number of wheels (60; 60') first surfaces (42'C; 142'C) for coupling to said wheels (60; 60') or to said supporting body (42; 162), about said axes of rotation, wherein said second moulding cavities or cavity (400; 400') are/is delimited by said first coupling surfaces (42'C; 142'C), wherein injection moulding of said wheels (60; 60') or of said supporting body (42; 162) determines creation in these/this of second surfaces (62C; 162C) against said first coupling surfaces (42'C; 142'C) for coupling of said number of wheels or of said supporting body to said supporting body or said wheels, and wherein said first and second surfaces (62C; 162C; 42'C; 142'C) have a conical or frustoconical shape that develops about said axes of rotation. - a supporting body (42; 162); - a number of wheels (60; 60') rotatably mounted on said supporting body (42; 162), about respective axes of rotation; - providing a moulding assembly (20; 20') for carrying out a process of injection moulding; - setting said moulding assembly (20, 20') in a first configuration in which a first moulding cavity or plurality of moulding cavities (300; 300') is defined for forming said supporting body (42; 162) or said number of wheels (60; 60'); - carrying out injection moulding of said supporting body (42; 162) or of said number of wheels (60; 60'), within said first moulding cavity or cavities (300; 300'), via a first plastic material; - setting said moulding assembly (20; 20') in a second configuration, defined in which are/is second moulding cavities or a second moulding cavity (400; 400') for producing said number of wheels (60; 60') or said supporting body (42; 162) on said supporting body (42; 162) or said number of wheels (60; 60'); - carrying out injection moulding of said number of wheels (60; 60') or of said supporting body (42; 162) on said supporting body (42; 162) or on said number of wheels (60; 60'), within said second moulding cavities or said second moulding cavity (400; 400'), via a second plastic material, wherein said first moulding cavity or cavities (300; 300') is/are configured for providing in said supporting body (42; 162) or in said number of wheels (60; 60') first surfaces (42'C; 142'C) for coupling to said wheels (60; 60') or to said supporting body (42; 162), about said axes of rotation, wherein