There is provided an antibacterial and deodorant fiber that exhibits excellent inhibition of bacterial growth, is capable of responding to a wide variety of odorants, does not discolor easily, and can maintain stable performance. An antibacterial and deodorant fiber characterized in that a fiber treatment agent comprising at least a component (A), and a component (B) and/or a component (C) below are attached thereto at 0.2 to 5 wt % of the total weight of the fiber, the fiber treatment agent containing 20 to 80 wt % of the component (A), and 80 to 20 wt % of the component (B) and/or the component (C): (A) at least one plant extract, said plant being at least one selected from the group consisting of tea leaves, aloe, bamboo, bamboo grass, Japanese butterbur (Petasites japonica), loofa (Luffa cylindrica), horsetail (Equisetum arvense), Japanese mugwort (Artemisia princeps), geranium (Geranium nepalense var. thunbergii), persimmon, and grapefruit; (B) at least one nonionic surfactant selected from the group consisting of an alkylene oxide adduct type nonionic surfactant and a polyhydric alcohol type nonionic surfactant; (C) at least one anionic surfactant selected from the group consisting of a carboxylic acid salt, sulfonic acid salt, sulfuric acid ester salt, and phosphoric acid ester salt.