Two activated carbon fibers supporting MnO particles (0.84wt% Mn and 1380m²g^-1, 11.84wt% Mn and 2050m²g^-1) were prepared from phenolic resins containing manganese acetate tetrahydrate and their deodorization abilities against H2S gas were examined. The former fiber contained the finely dispersed MnO particles and exhibited a high deodorization ability which is 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 H2S gas is prepared by supporting the fine MnO particles on the micropore surface more abundantly.