Ventilator

A ventilator, comprising:

• a body casing that has an opening formed in a lower portion and an exhaust port formed on one side;
• a fan that is provided in the body casing, sucks indoor air from the opening, and exhausts the indoor air from the exhaust port;
• a resin fan casing that has a suction port, is provided in the opening, closes the opening other than the suction port, and forms an air passage of the fan;
• a protection frame that is formed outside the air passage of the fan casing to cover a terminal block provided in an internal corner of the body casing outside the air passage of the fan casing;
• a resin terminal block cover that watertightly seals a protection frame opening of a lower portion of the protection frame and can be opened and closed;
• a sheet-metal case that is provided in the protection frame and stores the terminal block;
• a sheet-metal terminal block cover that opens and closes a lower opening of the sheet-metal case;
• and
• a rib provided on the rear side of the resin terminal block cover, such that the sheet-metal terminal block cover bumps against the rib and closing of the resin terminal block cover is disabled, when the resin terminal block cover is closed in a state in which the sheet-metal terminal block cover is opened.