Although the content ratios of flame-retardant cellulosic fiber (C), the cellulosic fiber (B) and the polyester fiber (D) can be determined by comfort such as texture and hygroscopicity, washing resistance, durability, and degree of flame retardance, it is preferable that the content of the flame-retardant cellulosic fiber (C) is 20 to 65% by weight and that of the cellulosic fiber (B) is 35 to 80