To provide a flameproof blind slat exhibiting a high degree of flameproof performance as a flameproof product with no risk of radio wave interference and excelling also in respect of environment because of not using a bromine-based flame retardant.

In the flameproof blind slat formed of a polycarbonate resin composition, the polycarbonate resin composition includes, as essential components, 100 pts.wt. of polycarbonate resin (A), 0.003-1.0 pts.wt. of metal salt (B) of organic aromatic sulfur compound, 0.1-1.5 pts.wt. of fiber formed type fluorine-containing polymer (C), and 0.15-1.5 pts.wt. of a light diffusing agent (D).