The present invention provides a water-permeability imparting agent, which can achieve the reduction in the returned liquid amount and impart high durable water permeability and good passability for carding machine to fiber without changing the structure of an absorbent article. A water permeable fiber adhered with the water-permeability imparting agent is also provided. The water-permeability imparting agent comprises: a (poly) amine cationized product (a), an ester (b), a dialkyl sulfosuccinate salt (c), an alkylphosphate salt (d), at least one of glycine derivatives selected from trialkylglycine derivative and (alkylamido group-containing alkyl) dialkylglycine derivative (e), and a polyoxyalkylene-modified silicone (f) wherein, component (a) is of 10 to 40 weight %, component (b) is of 10 to 40 weight %, component (c) is of 1 to 40 weight %, component (d) is of 10 to 60 weight %, component (e) is of 10 to 40 weight %, and component (f) is of 1 to 20 weight %.本發明提供一種無需改變吸收性物品的結構就可實現返液量的減少,賦予纖維高之耐久透水性和良好之梳理機通過性的透水性賦予劑以及附著有該透水性賦予劑的透水性纖維。透水性賦予劑包含:(聚)胺的陽離子化物(a)、酯(b)、磺酸基琥珀酸二烷基酯鹽(c)、烷基磷酸鹽(d)、選自三烷基甘胺酸衍生物及(含烷基醯胺基之烷基)二烷基甘胺酸衍生物之至少一種甘胺酸衍生物(e)、聚氧伸烷基改質矽酮(f),其中,成分(a)為10至40重量%、成分(b)為10至40重量%、成分(c)為1至40重量%、成分(d)為10至60重量%、成分(e)為10至40重量%、成分(f)為1至20重量%。
