A sanitary washing apparatus comprising a toilet seat on which a user is to sit, and a washing nozzle configured the discharge wash water toward a human body part of the user, the washing nozzle including: a water supply path configured to pass the wash water; an orifice configured to direct the wash water passed through the water supply path toward the human body part of the user when in use sitting on the toilet seat; a throat provided on a trajectory connecting the orifice and the human body part; a mixing chamber provided on a downstream side of the orifice and on an upstream side of the throat, an area of a cross section of the mixing chamber perpendicular to a discharge direction of the wash water being larger than an area of a cross section of the orifice perpendicular to the discharge direction wherein the orifice and the throat are provided in an end portion of the mixing chamber as viewing a cross section perpendicular to the discharge direction of the wash water, whereby the washing nozzle further includes: an air intake portion provided in a position away from the orifice, characterized in that the throat is configured to take air into the mixing chamber by a negative pressure generated by wash water flowing from the orifice toward the throat, wherein the mixing chamber is configured: - to generate a return flow therein by wash water flowing out from the orifice and having a flow direction changed by a wall face of the mixing chamber, - to mix the air sucked into the mixing chamber via the air intake portion into the return flow as an air bubble, and - that the return flow mixed with the air joins wash water flowing from the orifice toward the throat and is discharged from the throat. a water supply path configured to pass the wash water; an orifice configured to direct the wash water passed through the water supply path toward the human body part of the user when in use sitting on the toilet seat; a throat provided on a trajectory connecting the orifice and the human body part; a mixing chamber provided on a downstream side of the orifice and on an upstream side of the throat, an area of a cross section of the mixing chamber perpendicular to a discharge direction of the wash water being larger than an area of a cross section of the orifice perpendicular to the discharge direction wherein the orifice and the throat are provided in an end portion of the mixing chamber as viewing a cross section perpendicular to the discharge direction of the wash water, whereby the washing nozzle further includes: an air intake portion provided in a position away from the orifice, characterized in that the throat is configured to take air into the mixing chamber by a negative pressure generated by wash water flowing from the orifice toward the throat, wherein the mixing chamber is configured: - to generate a return flow therein by wash water flowing out from the orifice and having a flow direction changed by a wall face of the mixing chamber, - to mix the air sucked into the mixing chamber via the air intake portion into the return flow as an air bubble, and - that the return flow mixed with the air joins wash water flowing from the orifice toward the throat and is discharged from the throat. an air intake portion provided in a position away from the orifice, characterized in that the throat is configured to take air into the mixing chamber by a negative pressure generated by wash water flowing from the orifice toward the throat, wherein the mixing chamber is configured: - to generate a return flow therein by wash water flowing out from the orifice and having a flow direction changed by a wall face of the mixing chamber, - to mix the air sucked into the mixing chamber via the air intake portion into the return flow as an air bubble, and - that the return flow mixed with the air joins wash water flowing from the orifice toward the throat and is discharged from the throat. - to generate a return flow therein by wash water flowing out from the orifice and having a flow direction changed by a wall face of the mixing chamber, - to mix the air sucked into the mixing chamber via the air intake portion into the return flow as an air bubble, and - that the return flow mixed with the air joins wash water flowing from the orifice toward the throat and is discharged from the throat.