The present invention relates to saddle-riding type watercraft and other
small watercraft. In an embodiment, the invention is a small watercraft
capable of reducing noise by utilizing the sponson. For example, a small
watercraft is provided with a sponson made of synthetic resin,
characterized in that within the sponson there has been fixed a weight
matched to the frequency of the hull to thereby have a function as a
dynamic damper. In an embodiment, the weight is a plate-shaped weight
made of metal along the longitudinal direction of the sponson. In an
embodiment, the weight is embedded in the sponson along the longitudinal
direction thereof.