Oral cavity washing device

An oral cavity washing device comprising:

• a body unit including a tank which stores a washing liquid, a pump from which the washing liquid stored in the tank is discharged, and a case formed by joining a plurality of parts to each other so as to accommodate the pump;
• a tube connected to the body unit so as to make the discharged washing liquid flow through the tube;
• an operation part mounted on the case;
• a washing unit connected to the tube so as to discharge the washing liquid;
• and
• a seal structure having at least a first seal portion which seals a joint portion between two of the plurality of parts forming the case,
• wherein an upper surface of the case is positioned on substantially the same plane as an upper surface of the tank in a state where the tank is mounted on the case, the upper surface of the case forms a sealed member,
• the plurality of parts forming the case include a case body including an upper opening and a lower opening, an upper lid provided on the case body to close the upper opening, and a bottom lid provided on the lower opening to close the lower opening,
• the upper lid forms the upper surface of the case,
• the operation part is mounted on the upper surface of the case,
• the operation part includes an operation panel provided on the upper opening so as to be located under the upper lid,
• the first seal portion is provided between an outer peripheral portion of the operation panel and the case body, the first seal portion is sandwiched between the outer peripheral portion of the operation panel and the case body, and the first seal portion seals a joint portion between the upper lid and the case body,
• the seal structure further includes a second seal portion which seals a joint portion between the case and the operation part and forms a waterproof seal, and
• wherein the upper lid is fixed to the case body such that the upper lid is non-movable relative to the case body.