To reliably perform application, washing, and cleaning.

A brush tool has a brush body where brush bristle materials are projecting from a base material. Each brush bristle material includes: a brush root part 4a1 arranged in the base material; and a brush free end part 4a2 extending in a front end direction from the brush root part 4a1. The diameter of the brush free end part 4a2 is allowed to be smaller than the diameter of the brush root part 4a1, and also the front end of the brush free end part 4a2 is not sharpened. The brush free end part 4a2 is gradually reduced in diameter in extending toward the front end, keeps a fixed diameter in extending toward the front end, has multiple stages by keeping a fixed diameter in extending toward the front end, or has a deformation part where the front end is processed.