Disclosed is a flame retardant, high precision resin mechanical part for use in office automation machines required to function with high accuracy and high precision, which is made by injection molding a thermoplastic resin composition comprising: (A) an amorphous thermoplastic resin; (B) an inorganic filler in a scale form; and (C) a specific phosphoric acid ester in which phosphoric acid ester groups are bonded through a bisphenol. The high precision resin mechanical part of the present invention is free from conventionally experienced disadvantages, such as volatilization of a flame retardant contained in the resin, smoking caused by the volatilization of the flame retardant and occurrence of MD (mold deposit) during the production thereof by molding, and bleeding of the flame retardant during the use thereof. Further, the mechanical part of the present invention is unlikely to suffer from warpage, and has advantageously small shrinkage ratio during the production thereof by molding. The mechanical part of the present invention has also not only high precision but also various excellent mechanical properties, such as extremely low anisotropy in linear expansion coefficient, and excellent vibration characteristics. The high precision resin mechanical part of the present invention can be advantageously used as a mechanical part for high precision machines which are required to function with high accuracy and high precision even under various stringent conditions, such as computers, game machines, sound-reproducing systems, audio-visual machines, copiers, printers, facsimile machines, personal computers, word processors, portable communication apparatuses and composite machines composed thereof. IMAGE
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