Provided is an injection-molded article with excellent external appearance, low warping, heat resistance, and durability to heating and cooling. An injection-molded article for which (1) deflection temperature under load according to ISO 75-1 is 165-220°C, (2) surface gloss at 45° by the JIS Z8741 testing method is 95-110, (3)the flatness of flat plates of 120mm length, 120 mm width and 2 mm thickness with JIS B0021 is 0-2 mm, (4)after tensile property evaluation test pieces molded according to ISO 3167 were heat-treated for ten days in a 150°C hot air oven and then treated for 24 hours at 23 °C and 50% RH, stretch at break measured according to ISO 524-1, 2 is 1.5% or more.