PURPOSE: To execute a frictional resistance reducing measures simply by improving comprehensive energy efficiency by reducing frictional resistance in small energy consumption in a method to reduce friction of a sailing body and a friction reducing sailing body and a generating method of microbubbles used to reduce the friction and a device thereof.

CONSTITUTION: Bubble water mixed fluid is blown out from a fluid blowout port 3 toward an oblique rear part separated from a submerged surface 4 into a boundary layer formed in the vicinity of the submerged surface 4 of the hull 1, and bubbles more than a bubble independent case are sent into a desired bottom layer of the boundary layer by using kinetic energy of water having large mass, and friction is effectively reduced.