To provide a friction resistance reduced ship easily constructed by using an existing ship, suppressing the effect on the original performance of the existing ship to low, and reducing the construction cost.

This friction resistance reduced ship exhausts gas fed from a gas feed means 4 into underwater from adjacent to a stem 1a during navigation so that fine bubbles are interposed on the ship hull outer plate 1 so as to reduce the friction resistance between the ship hull and the water. In this case, a gas blow outlet part 2 for exhausting the gas, and a feed pipe 3 for discharging gas fed from the gas feed means 4 to the gas blow outlet part 2 are attached to the ship hull outer plate 1 from the outside of the ship hull.