A jet boat basically includes a hull, a first jet propulsion unit, a second jet propulsion unit, and a steering unit. The first jet propulsion unit is provided to the hull. The first jet propulsion unit has a first steering deflector with a first propulsion axis. The first steering deflector is movable with respect to the hull. The second jet propulsion unit is provided to the hull. The second jet propulsion unit has a second steering deflector with a second propulsion axis. The second steering deflector is movable with respect to the hull. The steering unit is operatively coupled to the first and second jet propulsion units. The first and second steering deflectors are oriented such that the first and second propulsion axes are non-parallel to a longitudinal center axis of the hull while the steering unit is in a straight steering position.