There is provided an antibacterial
fiber, an antibacterial twisted
yarn and an antibacterial cloth which exhibits high durability to post-
processing with water, detergent,
staining or the like at a small added amount. In an antibacterial
fiber200, an
antibacterial property imparting glass composition10 is fixed in a form of, for example, a particle on the surface of a
fiber substrate16 and / or dispersed and complexed in the fiber substrate16. An
antibacterial property imparting glass composition10 comprises 0.1 to 5.0% by weight of Ag2O in a composition containing 45-67 mol % of P2O5, 5 to 20 mol % of Al2O3, 1 to 40 mol % of 1 or 2 or more selected from MgO, CaO and ZnO, and 20 mol % or less of B2O3. An antibacterial fiber200 containing such the
antibacterial property imparting glass composition10 at a ratio of, for example, 0.1 to 5.0% by weight shows high
water resistance,
acid resistance, alkali resistance and detergent resistance in antibacterial property.