Abstract: A lavatory pan washing apparatus includes a water supply unit supplying washing water into a rim so that a whirling flow is formed in a lavatory bowl, an air inlet pipe connected to a water discharge channel continuing to the downstream side of a water sealing portion of a pan, an air sucking unit sucking air through the pipe from the channel, and a control unit configured to activate the water supply unit at a time of washing of the pan so that the washing water is supplied into the water sealing portion. The control unit is configured to start activation of the air sucking unit after rise of a water level in the lavatory bowl, so that air is sucked through the pipe from the channel. The control unit is configured to deactivate the water supply unit after air has flowed through the air inlet pipe into the channel.

Abstract: To provide a coupling member for fixing a toilet seat device with warm-water sprays on a toilet bowl that is able to prevent a bolt from being screwed too tightly.

Abstract: In a drain socket for a toilet stool includes a vertical pipe including an upper end connected with the discharge port of the toilet stool, an adjustable pipe extending substantially horizontally from the lower end of the vertical pipe and a connecting pipe between the adjustable pipe and a drain of a toilet. The vertical pipe has a bend causing the vertical pipe to have at its lower end an axis displaced longitudinally and rearward of the toilet stool from an axis at the upper end to define an eccentrically curved flow path. The flow path includes a part located near the bend and formed by increasing a transverse dimension of a longitudinal front end thereof with respect to the toilet stool so that the part has such a noncircular cross section in which a front portion of the section has a larger area than a rear portion of the cross section.