TOOTHBRUSH

The present invention provides a toothbrush that provides superior cleaning power and a superior impression from use. A toothbrush (1) includes a handle body (10) including a head portion (2), a neck portion (4) that extends from the head portion (2), and a handle portion (6) that extends from the neck portion (4), bristle bundles are implanted on a bristle implanted surface of the head portion (2), and a product of an amount of deflection A of the head portion (2), which is measured by a specific measurement method, and an amount of deflection B of the neck portion (4) is 0.8 to 10. (Figure 1A)