To provide a water intake device that can efficiently take in water.

When a water-surface motorcycle is made to travel while protruding a movable fin 31b provided at a venturi gate 31, downward from the bottom, water existing in front of the movable fin 31b is guided to a front intake along the movable fin 31b, and water coming around into the back face of the movable fin 31b is guided to a rear intake so as to improve intake efficiency in a jet propulsion part.