Abstract: A toilet flush tank is provided that is capable of preventing an increase in the external dimensions of a toilet main body even when the toilet flush tank is placed below the upper surface of a toilet main body and is also capable of performing toilet cleaning in a stable manner. A toilet flush tank stores cleaning water to be provided to a toilet main body having a toilet bowl and a toilet drainage channel that communicates with the downstream side of the toilet bowl. This toilet flush tank is placed inside a space below the toilet bowl and provided with a recessed portion that conforms to the shape of the toilet drainage channel at the upper surface of the toilet flush tank.

Abstract: A toilet flush tank is provided that is capable of preventing an increase in the external dimensions of a toilet main body even when the toilet flush tank is placed below the upper surface of a toilet main body and is also capable of performing toilet cleaning in a stable manner. A toilet flush tank stores cleaning water to be provided to a toilet main body having a toilet bowl and a toilet drainage channel that communicates with the downstream side of the toilet bowl. This toilet flush tank is placed inside a space below the toilet bowl and provided with a recessed portion that conforms to the shape of the toilet drainage channel at the upper surface of the toilet flush tank.

Abstract: An air suction device for a toilet drainage channel, capable of good and silent toilet flushing. The air suction device (200) for the toilet drainage channel (5) has air suction means for sucking air from the toilet drainage channel (5) connected to the downstream side of a water sealing part (4) of a toilet body (1). The air suction means has an ejector (30) serving as a negative pressure generator and also has a suction tank (80) connected between the ejector (30) and the toilet drainage channel (5). The air suction device (200) further has a control device (C) for controlling both execution of a suction stroke in which the suction tank (80) exhausts air into the toilet drainage channel (5). The control device (C) executes the air suction stroke after the start of the supply of flush water to the bowl (2) of the toilet body (1) and then executes the air exhaust stroke before the completion of the supply of the flush water to the bowl (2).