Flush toilet device

A flush toilet device configured to perform flushing with flush water stored in a flush water tank, the flush toilet device comprising:

• a flush toilet main body including a bowl and a drain trap conduit extending from a lower portion of the bowl;
• a flush water tank disposed at a rear portion of the flush toilet main body and configured to store the flush water for flushing the bowl of the flush toilet main body;
• a first drain valve configured to switch between spouting and stopping the flush water from a rim spout port provided at an upper edge portion of the bowl by opening and closing a first drain port provided in the flush water tank;
• a second drain valve configured to switch between spouting and stopping the flush water from a jet spout port provided in the lower portion of the bowl by opening and closing a second drain port provided in the flush water tank;
• and
• a hydraulic drive mechanism configured to open the first drain valve or the second drain valve by using water supply pressure of the flush water supplied from a tap water supply line to the flush water tank.