Flush toilet apparatus

A flush toilet apparatus that discharges waste to a drain pipe by wash water, the flush toilet apparatus comprising:

• a toilet body comprising a bowl portion that receives waste, wherein a water conduit for guiding water supplied as wash water to the bowl portion is formed inside;
• a tank storing water inside and arranged to be able to supply the water to an inlet of the water conduit;
• and
• a jet pump unit arranged inside of the tank,
• the jet pump unit comprising:
• a throat pipe, wherein one end is connected to the inlet of the water conduit, a suction port is formed on the other end, a central axis of the throat pipe is arranged to be substantially along a left-right direction of the tank when viewed from the top, and the suction port is arranged to be positioned at a lower part near one of left and right end portions inside of tank;
• and
• a nozzle that injects high-speed water toward the inside of the throat pipe from the suction port to induce a jet pump action, wherein
• the tank is installed at a part on a backward side of an upper surface of the toilet body and comprises:
• a first tank portion;
• and a second tank portion formed so as to extend part of a bottom wall of the first tank portion downward,
• at least part of the second tank portion is formed at a position overlapping with the suction port when viewed from the top, and
• a bottom wall of the second tank portion does not overlap with the toilet body when viewed from the top and is arranged at a position on a lateral side of the toilet body and on a lower side of the upper surface of the toilet body.