To provide a toothbrush by which a proper bacterial plaque-removing effect and a proper brushing feeling can be obtained, and which can effectively reduce gum-harming property, and can provide a soft feeling to gums.

In this toothbrush 10, a large number of tufts 12 for which bristles 11 are bundled are planted on a bristling base 14 in the longitudinal and lateral directions. In such a toothbrush 10, the bristle 11 constituting the tuft 12 has a circular cross section shape, and also is equipped with a flat distal end section 16. In the flat distal end section, the side surface sections are cut of by a pair of tapered surfaces 13 which are extended in the diagonal directions being opposite from each other, from the center of the distal end. Then, the ratio of the minimum width of the bristle 11 to the maximum width at a location of 0.2 mm from the distal end is 0.30 or lower. Also, the ratio of the minimum width of the bristle 11 to the maximum width at a location of 1.0 mm from the distal end is 0.25 to 0.65. In addition, that of the minimum width of the bristle 11 to the maximum width at a location of 2.0 mm from the distal end is 0.65 or higher.