Flush toilet apparatus

A flush toilet apparatus that washes a toilet body by wash water, the flush toilet apparatus comprising:

• a wash-down toilet body comprising:
• a bowl portion that receives waste;
• and a water ejection portion that ejects water for discharging the waste to supply the water to the bowl portion, wherein the water supplied to the bowl portion pushes out the waste to a drainage channel;
• a tank storing water inside;
• and
• a jet pump unit arranged in a state that at least part of the jet pump unit is submerged inside of the tank, wherein
• the jet pump unit comprises:
• a throat pipe that is a pipe provided with a suction port near one end and that is arranged so that water entering inside from the suction port is supplied to the water ejection portion, and the water is ejected from the water ejection portion as wash water;
• and
• a nozzle that injects high-speed water from the suction port toward the inside of the throat pipe,
• the jet pump unit is configured to induce a jet pump action for making a flow rate of the water flowing inside of the throat pipe higher than a flow rate of the water injected from the nozzle and to supply the water at the increased flow rate to the water ejection portion,
• the flush toilet apparatus further comprises a channel state switching portion for switching a channel state of the jet pump unit to sequentially execute a water flow forming step, in which the jet pump unit supplies water at a first flow rate to the water ejection portion, and a water flow maintaining step, which is a step following the water flow forming step and in which the jet pump unit supplies water at a second flow rate lower than the first flow rate, and higher than the rate at which the nozzle injects the water, to the water ejection portion,
• the throat pipe comprises:
• a rising portion extending upward from the suction port;
• and a curved portion arranged on the downstream side of the rising portion,
• the channel state switching portion comprises an air introduction pipe provided with an introduction port for introducing air, and
• the air introduction pipe is connected to the rising portion of the throat pipe.