Antenna member

An antenna member comprising an injection molded body made of a thermoplastic resin composition, and a metal coating on at least a portion of the injection molded body,

• wherein the thermoplastic resin composition comprises (A) a thermoplastic resin, the (A) thermoplastic resin comprising (A-a) a polyphenylene ether-based resin,
• a deflection temperature under load (DTUL) of the thermoplastic resin composition is 120° C. or higher, and
• when a temperature range while the thermoplastic resin composition is heated from −30° C. to 120° C. is divided into temperature ranges with intervals of 10° C., and a low temperature side and a high temperature side of respective two adjacent temperature ranges are defined as a low temperature range and a high temperature range, respectively, a low temperature range expansion coefficient of the resin composition in a TD direction (mm/mm/° C.) and a high temperature range expansion coefficient of the resin composition in the TD direction (mm/mm/° C.), as measured by the method described in ISO 11359, satisfy the following relationship in any of the two adjacent temperature ranges:
• −50≤((high temperature range line expansion coefficient−low temperature range line expansion coefficient)/low temperature range line expansion coefficient)×100≤50.