A frictional resistance reduced ship comprising: a ship body having a ship bottom; an air ejecting unit configured to eject air into water from an air ejecting outlet provided in the ship bottom of the ship body of said ship; and an air recovery device configured to recover the air into said ship body from air recovery inlets, wherein said air recovery inlets are arranged on a side of a stern from said air ejecting outlet and on a side of a bow from a propeller provided to the ship body, wherein said propeller is arranged on a center line of said ship body extending in a ship length direction and transverse to a ship width direction from a port side to a starboard side, wherein said air recovery inlets comprise: a central air recovery inlet provided to cross the center line; a port-side air recovery inlet provided not on the center line but on the port side so that said port-side air recovery inlet projects on the port side from said central air recovery inlet; and a starboard-side air recovery inlet provided not on the center line but on the starboard side so that said starboard-side air recovery inlet projects on the starboard side from said central air recovery inlet, wherein said port-side air recovery inlet and said starboard-side air recovery inlet are arranged on the bow side from said central air recovery inlet, and wherein each of said central air recovery inlet, said port-side air recovery inlet, and said starboard-side air recovery inlet comprises a plurality of air recovery holes, characterized in that the ship bottom is formed to be a flat surface, and in that said air recovery inlets are respectively formed in a bottom plate of an air recovery chamber and the bottom plates are positioned on the same surface as an outer plate of the ship bottom. a ship body having a ship bottom; an air ejecting unit configured to eject air into water from an air ejecting outlet provided in the ship bottom of the ship body of said ship; and an air recovery device configured to recover the air into said ship body from air recovery inlets, wherein said air recovery inlets are arranged on a side of a stern from said air ejecting outlet and on a side of a bow from a propeller provided to the ship body, wherein said propeller is arranged on a center line of said ship body extending in a ship length direction and transverse to a ship width direction from a port side to a starboard side, wherein said air recovery inlets comprise: a central air recovery inlet provided to cross the center line; a port-side air recovery inlet provided not on the center line but on the port side so that said port-side air recovery inlet projects on the port side from said central air recovery inlet; and a starboard-side air recovery inlet provided not on the center line but on the starboard side so that said starboard-side air recovery inlet projects on the starboard side from said central air recovery inlet, a central air recovery inlet provided to cross the center line; a port-side air recovery inlet provided not on the center line but on the port side so that said port-side air recovery inlet projects on the port side from said central air recovery inlet; and a starboard-side air recovery inlet provided not on the center line but on the starboard side so that said starboard-side air recovery inlet projects on the starboard side from said central air recovery inlet, wherein said port-side air recovery inlet and said starboard-side air recovery inlet are arranged on the bow side from said central air recovery inlet, and wherein each of said central air recovery inlet, said port-side air recovery inlet, and said starboard-side air recovery inlet comprises a plurality of air recovery holes, characterized in that the ship bottom is formed to be a flat surface, and in that said air recovery inlets are respectively formed in a bottom plate of an air recovery chamber and the bottom plates are positioned on the same surface as an outer plate of the ship bottom.