To provide a bristle material for washing brush that can evenly remove stains or foreign matter adhering to an object to be cleaned and is excellent in a property of the foreign matter removed by cleaning being hardly adhering to a tuft and between tufts, and to provide a washing brush using the bristle material for washing brush at least in a part thereof.

The bristle material for washing brush is composed of a core-sheath conjugate monofilament using a polyamide resin in a core part and a modified ethylene-tetrafluoroethylene copolymer resin having a reactive group in a sheath part, having a diameter of 0.05-1.0 mm and the cross section ratio of the core part/sheath part being within a range of 10/90-40/60.