A sanitary washing apparatus comprising: a washing water supplying device that is suitable for supplying washing water at a pressure that fluctuates; an air supplying device that is suitable for supplying air at a pressure that fluctuates; and a spraying device that has a spray port, and is suitable for spraying the washing water supplied by said washing water supplying device and the air supplied by said air supplying device from said spray port, wherein the pressure of the washing water supplied by said washing water supplying device and a pressure of the air supplied by said air supplying device are set such that the pressure of the air supplied to said spraying device is higher than the pressure of the washing water supplied to said spraying device at least once in a period where the washing water is being sprayed from said spraying device, characterized in that the pressure of the air supplied to said spraying device is set lower than a maximum value of the pressure of the washing water supplied to said spraying device, said air supplying device includes an air pressurizing device that is suitable for pressurizing the air at a pressure that periodically fluctuates, said washing water supplying device includes a washing water pressurizing device that is suitable for pressurizing the washing water supplied from a water supply source at a pressure that periodically fluctuates, and the pressure of the washing water pressurized by said washing water pressurizing device and the pressure of the air pressurized by said air pressurizing device are set such that a maximum value of the pressure of the air supplied to said spraying device is higher than a minimum value of the pressure of the washing water supplied to said spraying device. a washing water supplying device that is suitable for supplying washing water at a pressure that fluctuates; an air supplying device that is suitable for supplying air at a pressure that fluctuates; and a spraying device that has a spray port, and is suitable for spraying the washing water supplied by said washing water supplying device and the air supplied by said air supplying device from said spray port, wherein the pressure of the washing water supplied by said washing water supplying device and a pressure of the air supplied by said air supplying device are set such that the pressure of the air supplied to said spraying device is higher than the pressure of the washing water supplied to said spraying device at least once in a period where the washing water is being sprayed from said spraying device, characterized in that the pressure of the air supplied to said spraying device is set lower than a maximum value of the pressure of the washing water supplied to said spraying device, said air supplying device includes an air pressurizing device that is suitable for pressurizing the air at a pressure that periodically fluctuates, said washing water supplying device includes a washing water pressurizing device that is suitable for pressurizing the washing water supplied from a water supply source at a pressure that periodically fluctuates, and the pressure of the washing water pressurized by said washing water pressurizing device and the pressure of the air pressurized by said air pressurizing device are set such that a maximum value of the pressure of the air supplied to said spraying device is higher than a minimum value of the pressure of the washing water supplied to said spraying device.