A sanitary washing apparatus having a bidet washing function for jetting water at private parts of a female user, the apparatus including a casing and a toilet seat, the toilet seat being pivotally supported on the casing in an openable/closable manner, the apparatus including a nozzle including a jetting port (411, 433) configured to jet water, wherein the nozzle includes: a nozzle body; a nozzle body flow channel provided in the nozzle body for passing water supplied from a water source; a jetting means including a swirling chamber capable of generating a swirling flow, a communication channel configured to guide the swirling flow to the jetting port (411, 433) in the nozzle body, the swirling chamber having an inner peripheral wall (423e, 423f), the nozzle body flow channel being connected to the swirling chamber in a tangential direction of the inner peripheral wall (423e, 423f) such that water flowing in from the nozzle body channel swirls along the inner peripheral wall (423e, 423f); and a granular-flow generating means including an annular flow channel provided on downstream side of the jetting means, and being configured so that a downstream end portion of the annular flow channel constitutes the jetting port (411, 433) of the nozzle, and the annular flow channel guides the swirling flow to the jetting port (411,433), in use, the jetting means jets water as a hollow-conic-shape liquid film flow formed from the swirling flow at the private parts of the female user from the jetting port (411, 433) and in use, the granular-flow generating means generates an intermittent granular flow of granular water balls so as to fill inside the liquid film by fragmenting the liquid film flow before the liquid film flow impinges on the private parts, the annular flow channel being configured to generate a water flow in a direction traversing the liquid film flow and to produce a velocity difference between velocity outside the liquid film flow and velocity inside the liquid film flow so as to cause a crack in the traversing direction of the liquid film flow, thereby fragmenting the liquid film flow. a nozzle body; a nozzle body flow channel provided in the nozzle body for passing water supplied from a water source; a jetting means including a swirling chamber capable of generating a swirling flow, a communication channel configured to guide the swirling flow to the jetting port (411, 433) in the nozzle body, the swirling chamber having an inner peripheral wall (423e, 423f), the nozzle body flow channel being connected to the swirling chamber in a tangential direction of the inner peripheral wall (423e, 423f) such that water flowing in from the nozzle body channel swirls along the inner peripheral wall (423e, 423f); and a granular-flow generating means including an annular flow channel provided on downstream side of the jetting means, and being configured so that a downstream end portion of the annular flow channel constitutes the jetting port (411, 433) of the nozzle, and the annular flow channel guides the swirling flow to the jetting port (411,433), in use, the jetting means jets water as a hollow-conic-shape liquid film flow formed from the swirling flow at the private parts of the female user from the jetting port (411, 433) and in use, the granular-flow generating means generates an intermittent granular flow of granular water balls so as to fill inside the liquid film by fragmenting the liquid film flow before the liquid film flow impinges on the private parts, the annular flow channel being configured to generate a water flow in a direction traversing the liquid film flow and to produce a velocity difference between velocity outside the liquid film flow and velocity inside the liquid film flow so as to cause a crack in the traversing direction of the liquid film flow, thereby fragmenting the liquid film flow.