To provide a toothbrush planted with highly elastic and highly tapered bristles and a manufacturing method therefor.

Bristles planted in this toothbrush are made of a polyethylene terephthalate or polybutylene terephthalate material and respectively have a diameter of the end part not larger than 0.02 mm and a tapered part not longer than 3.5 mm from the termini. The manufacturing method of the toothbrush is as follows: Parts 3.5 mm from the end parts of monofilaments for a toothbrush are dipped into an errosing chemical such as sulfuric acid, caustic soda and retained immediately after length of the monofilaments comes to short, then neutralized, washed by water, and dried. The monofilaments are planted in a toothbrush rod and polished by No. 240 mesh polishing cloth rotating at 2660-2700 rpm for 3-10 seconds, then using No.320 mesh polishing cloth, at the same rotating speed for 3-10 seconds, and finally by using No.400 polishing cloth, at the same rotating speed for 3-10 seconds.