Toothbrush

The purpose of the present invention is to provide a toothbrush having excellent insertion properties, workability, and durability. The maximum thickness of the head part (5) is more than 2.0 mm and less than 4 mm; when the toothbrush body (2) is viewed from the side, the bristle planting surface side has a first linear region (S1) extending continuously and linearly from the bristle planting surface (5a), and a first curved region (E1) having a center of curvature on the bristle planting surface side and extending in an arc shape from a first inflection point (P1) to the rear end side. A second curved region (E2) having a center of curvature on the back surface side opposite to the flocking surface side and extending in an arc shape from a second inflection point (P2) located at the rear end of the first curved region toward the rear end side; and the inclination angle of the neck part is more than 8 degrees and less than 25 degrees. 本发明的目的在于提供一种插入性、操作性和耐久性优异的牙刷。头部(5)的最大厚度为2.0mm以上、不足4mm；侧视牙刷主体(2)时，植毛面侧具有：从植毛