To provide a toothbrush prevented from harmful influence of itself, of which structural components can be splitted into individual parts or exchangeable, and properly brushing teeth with personal difference taken into consideration.

A brush head 1 of the toothbrush composed of a head part 10 provided with raised bound bristles of the toothbrush, a neck part 20 of which the front edge is attached by the head part 10, and a holder part 30. The head part 10 is composed of a single head or a plurality of split heads, and an adjusting part 32 for adjusting the length of the neck part 20 is provided with a front edge of the holder part 30.