To provide a bristle material for toothbrush which has excellent cleaning effect and is excellent in durability and flexibility while hardly damaging a cleaned object in comparison with the conventional bristle material for the toothbrush made of synthetic resin and a toothbrush product.

In the bristle material for the toothbrush consists of a cut bristle of monofilament made of synthetic resin, the cross-section of the monofilament is constituted by annularly connecting a plurality of unit shapes, and is a modified hollow cross-section having a hollow part at the center, and a branch bristle is formed for every unit shape at least at one end of the cut bristle, and a taper part is formed at the tip of the branch bristle.