TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The biaxial orientation polyarylene sulfide film contains (in weight parts) polyarylene sulfide (60-99) and thermoplastic resin (A) (1-40). A silicon atom of a siloxane bond is contained in the surface of dispersed phase consisting of thermoplastic resin (A). Preferred Resin: The thermoplastic resin (A) forms dispersed phase having average value of diameter of mean dispersion of 10-500 nm. The polyarylene sulfide is polyphenylene sulfide. The thermoplastic resin (A) is polyamide, polyether imide, polyether sulfone and/or polysulfone. Preferred Properties: The biaxial orientation polyarylene sulfide film has orientation degree of longitudinal direction and width direction of the film by laser Raman spectroscopy of 1-3, and tensile rupture elongation in film length direction and/or width direction of 100-250%. EXAMPLE - Polyphenylene sulfide (in weight parts) (90) having melt viscosity of 200 Pa.second at 310degreesC and shear rate of 1000/second, glass transition temperature of 90degreesC and melting point of 285degreesC was dried under reduced pressure at 180degreesC for 3 hours. Nylon 6/66 copolymer (thermoplastic resin) (10) was dried under reduced pressure at 120degreesC for 3 hours. The polyphenylene sulfide and nylon 6/66 copolymer were mixed. Then, KBE9007 (RTM: gamma-isocyanate propyl trimethoxy silane) (compatibilizing agent) (0.5) was added, melt extrusion was carried out for residence time of 90 seconds, and discharged as strand. The obtained strands were cooled with water at 25degreesC, cut and blend chip was produced. Calcium carbonate powder (0.3 wt.%) with average particle diameter of 1.2 microns and calcium stearate (0.05 wt.%) were further added to blend chip, mixed uniformly and dried at 180degreesC under reduced pressure for 3 hours. The polymer mixture was extruded at 320degreesC, and unstretched film was produced. The unstretched film was extended in length direction and width direction, heat processed at 260degreesC for 10 seconds, and cooled to room temperature. The edges of film were removed, and biaxial orientation polyphenylene sulfide film having thickness of 125 microns was produced. The film had excellent tensile elongation and moldability.