To provide an integrally blow molded office chair and cut significantly production cost by using a plastic composite for the material to integrally blow mold, the material having plasticity after molded and not causing a feeling of unsuitableness attributed to oversolidification, and a blow molding method not requiring an internal die and reducing the use of dies.
A backrest, a seat plate, and armrests are integrally blow molded and joined and fixed, thus saving assembly time and cost, significantly increasing the joining and fixing capability among the backrest, seat plate and armrests, eliminating the need for extra caulking of the seat plate and the backrest for assembly, markedly cutting manufacturing time and cost by a fixing method by which the backrest, the seat plate and the armrests are connected by iron pieces, and increasing industrial utility and economic merits.
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