To provide a power board capable of improving portability, capable of reducing weight, and capable of securing large buoyancy.

This power board 1 is formed by arranging an engine 9, and a water jet propelling machine 10 driven by this engine in a rear part of a hull 2. The hull 2 is expandably-contractibly constituted of an elastic body (rubber). Since the hull 2 is expandably-contractibly constituted of the elastic body (the rubber), when carrying the power board 1, the hull 2 can be miniaturized by bleeding air from the hull 2, and the power board 1 can be easily carried so that the portability is enhanced. Since the hull 2 is constituted of the lightweight elastic body (the rubber) inflating by air instead of a conventional rigid body, weight of the power board 1 can be reduced, and high buoyancy can be obtained.