PROBLEM TO BE SOLVED: To provide an easy-to-use oral cavity washing device.SOLUTION: An oral cavity washing device 10 comprises: a tank 40 that stores washing liquid； a body 20 to which the tank 40 is attached； a washing unit 100 including a discharge port 810 that discharges the washing liquid； and a tube 50 that connects the body 20 and the washing unit 100. The oral cavity washing device 10 also comprises: a washing passage 60 formed in the body 20, the tube 50, and the washing unit 100 to cause the tank 40 to communicate with the discharge port 810； a pump 30 that discharges the washing liquid stored in the tank 40, to the tube 50； and an air intake passage 70 that supplies air to the washing passage 60. The oral cavity washing device 10 also comprises a switch 600 attached to the washing unit 100 to open or close the air intake passage 70.SELECTED DRAWING: Figure 1
