[problem] while adopting the air pump of inexpensive motorized with a small compact of output, to provide an oral cleaning device, which may be enough to ensure the discharge pressure of the cleaning liquid the solution tank 2 can be closed airtight for storing the A cleaning liquid, provided the discharge opening 4a for discharging the cleaning liquid into the oral cavity at one end, opening into the bottom of the solution tank 2 to the other end a cleaning liquid supply passage 24 provided with inlet 23a for, by supplying air into the cleaning liquid tank 2, and an air pump 44 of the electric pressurizing the inside solution tank 2, the air pressure in the cleaning fluid tank 2, the washing liquid and it supplies the cleaning liquid in the cleaning solution tank 2 to the discharge port 4a through the supply passage 24. The air inlet holes 71 which open in the middle portion of the cleaning liquid supply passage 24 is provided, a portion of the air supplied from the air pump 44 to the solution tank 2, is supplied to the cleaning liquid supply passage 24 through the air inlet holes 71, the discharge port 4a a cleaning liquid pulsing discharge from【課題】出力の小さい小型で安価な電動式の空気ポンプを採用しつつ、洗浄液の吐出圧を十分に確保し得る口腔洗浄装置を提供する。【解決手段】洗浄液を貯留する気密に閉鎖可能な洗浄液タンク2と、一端に口腔内へ洗浄液を吐出するための吐出口4aを設け、他端に洗浄液タンク2の底部内に開口する導入口23aを設けた洗浄液供給通路24と、洗浄液タンク2内へ空気を供給して、洗浄液タンク2内を加圧する電動式の空気ポンプ44とを備え、洗浄液タンク2内の空気圧により、洗浄液供給通路24を通じて洗浄液タンク2内の洗浄液を吐出口4aへ供給する。洗浄液供給通路24の途中部に開口する空気導入孔71を設け、空気ポンプ44から洗浄液タンク2に供給される空気の一部を、空気導入孔71を通じて洗浄液供給通路24に供給し、吐出口4aから洗浄液を脈動吐出させる。
