ure of the toothbrush by the toothbrush manufacturing apparatus 10. [0087] [1] Introducing Step of the Bristles Into Sleeve (FIG. 4) [0088] (1) Filling the stack 30 with the bristles 1 made of a resin, for example, a polyamide such as a nylon or the like, a polyester such as a polybutylene terephthalate, or the like. [0089] (2) Sticking the sleeve 60 into the bristles stack 30, and introducing a p