To provide a mouth cavity cleaning device in which suction and water-supply can be performed simultaneously, the device can be used safely and easily without using a pump for water supply.SOLUTION: A suction passage 3 and a water-supply passage 4 are fixed to a cleaning head 2, and a suction opening 14 and a water-supply opening 15 are provided at a bottom surface 16. An outer peripheral part 17 surrounding a whole circumference by protruding from the bottom surface 16 is formed in an outer wall-like shape using a non-air-permeable member. When a tip 18 of the outer peripheral part is brought into contact with a cleaned surface during mouth cavity cleaning, a closed space is formed between the bottom surface 16, the outer peripheral part 17, and a mucosa in a mouth cavity and water is supplied by a negative pressure by suction force.SELECTED DRAWING: Figure 2【課題】吸引と給水を同時に行うことが可能な口腔洗浄器において、給水用のポンプを使用せず、より安全で簡便に使用出来る吸引給水式の口腔洗浄器を提供する。【解決手段】清掃ヘッド2に吸引路3と給水路4が固定され、底面部16に吸引開口部14と給水開口部15が配置される。底面部16から突出させて全周を取り囲む外周部17が非通気性部材を用いて外壁状に形成されて、口腔洗浄時に外周部先端18が被洗浄面に接した時に、底面部16と、外周部17と、口腔内粘膜とによって密閉空間が形成され、吸引力による負圧によって給水する。【選択図】図2