Two activated carbon fibers supporting MnO particles (0.84 wt % Mn and 1380m 2 g - 1 , 11.84wt % Mn and 2050m 2 g - 1 ) were prepared from phenolic resins containing manganese acetate tetrahydrate and their deodorization abilities against H 2 S gas were examined. The former fiber contained finely dispersed MnO particles and exhibited a high deodorization ability which resulted from both a high specific surface area and the supported fine MnO particles. The ability of the latter fiber was not so high in spite of having a large surface area supporting a larger amount of MnO, because the large MnO particles deposited in the activated carbon fiber and on its surface abundantly. It was revealed that a high quality deodorant activated carbon fiber against H 2 S gas is prepared by supporting the fine MnO particles on the micropore surface more abundantly.