PURPOSE: To provide a vessel body propulsion method utilizing the bubbles which does not require the propulsion device such as a screw propeller and a water jet pump.

CONSTITUTION: A downward opened port type air blowing recessed groove S having a groove bottom part 16 forming a rearward rising inclined surface having a constant angle are formed in arrangement on the bottom surface and/or on the left and right side surfaces of a vessel body A, and the compressed air is supplied into the air blowing recessed groove S from the front side, and the air forms bubbles, and the vertical component of force acting on the groove bottom part 16 is used as floating-up force, and the horizontal component of force acting on the groove bottom part 16 is used as propulsion force, and the vessel body A is advanced.