A method of using a water discharge device that discharges water to a human body, the method comprising the steps of: supplying the water from a water supply path; jetting the water through a jetting port by supplying water from the water supply path to a downstream side as a jet flow; discharging the jet flow to the outside through a discharge port, the discharge port (NZa) being included in a discharge channel provided on the downstream side of the jetting port; passing the jet flow from the jetting port to the discharge channel through a water passing path section of a water storage chamber, the water storage chamber further comprising a water storing section forming stored water in the water storing section to be adjacent to the water passing path section; and leading the air into the water storing section through an air lead-in port of an air bubble supplying section, generating an air bubble by changing the air in a bubble form in the water storing section, and supplying the air bubble to the water passing path section, wherein the method of using the air bubble supplying section further being characterised in that it comprises furthermore the steps of: growing the air bubble to generate an air bubble having a cross sectional area larger than a channel sectional area of the jetting port, supplying the large air bubble to the water passing path section, supplying the large air bubble to the water passing path section intermittently from the air bubble supplying section alternately and repeatedly generating a first water passing state in which the jet flow pierces through the large air bubble, by supplying the air bubble and a second water passing state in which the jet flow passes through the stored water, by not supplying the air bubble in the process in which it is grown to generate the large air bubble and varies water passing resistance of the jet flow in the water passing path section. supplying the water from a water supply path; jetting the water through a jetting port by supplying water from the water supply path to a downstream side as a jet flow; discharging the jet flow to the outside through a discharge port, the discharge port (NZa) being included in a discharge channel provided on the downstream side of the jetting port; passing the jet flow from the jetting port to the discharge channel through a water passing path section of a water storage chamber, the water storage chamber further comprising a water storing section forming stored water in the water storing section to be adjacent to the water passing path section; and leading the air into the water storing section through an air lead-in port of an air bubble supplying section, generating an air bubble by changing the air in a bubble form in the water storing section, and supplying the air bubble to the water passing path section, wherein the method of using the air bubble supplying section further being characterised in that it comprises furthermore the steps of: growing the air bubble to generate an air bubble having a cross sectional area larger than a channel sectional area of the jetting port, supplying the large air bubble to the water passing path section, supplying the large air bubble to the water passing path section intermittently from the air bubble supplying section alternately and repeatedly generating a first water passing state in which the jet flow pierces through the large air bubble, by supplying the air bubble and a second water passing state in which the jet flow passes through the stored water, by not supplying the air bubble in the process in which it is grown to generate the large air bubble and varies water passing resistance of the jet flow in the water passing path section. growing the air bubble to generate an air bubble having a cross sectional area larger than a channel sectional area of the jetting port, supplying the large air bubble to the water passing path section, supplying the large air bubble to the water passing path section intermittently from the air bubble supplying section alternately and repeatedly generating a first water passing state in which the jet flow pierces through the large air bubble, by supplying the air bubble and a second water passing state in which the jet flow passes through the stored water, by not supplying the air bubble in the process in which it is grown to generate the large air bubble and varies water passing resistance of the jet flow in the water passing path section.