To solve such a problem that although a surfboard can obtain linear advancement property and a speed when camber of a tail rocker is small and it can obtain rotation property when the camber is large, since all present surfboards are made of a uniform material, the tail rocker also has a constant shape.

A groove reaching to a runway surface is provided on a surface of a rear camber part of the surfboard and an article of softer material having flexibility than a body is clamped in a groove. Thereby, it can be made to a shape capable of obtaining the linear advancement property and the speed. When a user is about to be turned, a center of gravity is applied to a surface of the surfboard tail and the camber of the tail rocker of the surfboard becomes large by a water pressure applied to a back surface. The surfboard also having the rotation property can be created.