To provide an oral cavity cleaning device having high added value and a nozzle thereof.SOLUTION: The oral cavity cleaning apparatus is provided with a nozzle 40 including a flow path forming portion 50 provided with a flow path FP including an inflow port and an outflow port 41A, a flow rate control device for controlling flow rate of a washing liquid injected from an outflow port 41A at 200 to 350 mL / min, and a pump for supplying the washing liquid to the inflow port so as to be contained within the range of. The flow passage forming portion 50 includes a first constituent portion 51 including a first flow passage FP 1 forming the flow passage FP, a contraction portion 53 provided on the downstream side of the first constituent portion 51 to narrow the flow passage FP, a reduction portion And a second constituent part 52 provided on the downstream side of the part 53 and including a second flow path FP 2 which becomes wider from the side of the reduction part 53 toward the side of the outflow port 41 A. The flow rate of the washing liquid injected from the outflow port 41 A is The first constituent part 51, the contraction part 53, and the second constituent part 52 are configured so that cavitation occurs in the washing liquid flowing through the channel FP when it is included in the range of 200 to 350 mL / min.(FIG.【課題】高い付加価値を備える口腔洗浄装置およびそのノズルを提供する。【解決手段】口腔洗浄装置は、流入口および流出口41Aを含む流路FPが設けられた流路構成部50を含むノズル40と、流出口41Aから噴射される洗浄液の流量が200~350mL/minの範囲に含まれるように流入口に洗浄液を供給するポンプとを備える。流路構成部50は、流路FPを構成する第1流路FP1を含む第1構成部51と、第1構成部51の下流側に設けられ、流路FPを狭める縮小部53と、縮小部53の下流側に設けられ、縮小部53側から流出口41A側に向かうにつれて広くなる第2流路FP2を含む第2構成部52とを含み、流出口41Aから噴射される洗浄液の流量が200~350mL/minの範囲に含まれる場合に流路FPを流れる洗浄液にキャビテーションが発生するように第1構成部51、縮小部53、および、第2構成部52が構成されている。【選択図】図3
