Abstract: A drain socket includes a first connection part connected to a drain pipe of a toilet bowl; a second connection part connected to a drain piping in a floor or the like; and a drain channel body connecting the first connection part and the second connection part. The drain channel body includes an inclined part inclined to one side in the front-back direction toward a lower side. A restriction part is provided at an upstream end portion of the drain channel body. A surface of the restriction part located on the one side where the inclined part is inclined has a portion where a horizontal distance from a center C of the first connection part increases from the center of the surface in the left-right direction toward an end side of the surface in the left-right direction.

Abstract: A flush toilet includes a toilet bowl part structured to have a bowl-like waste receiving surface, a rim part structured to form an upper end side portion of the toilet bowl part, and a water discharge part structured to discharge flush water into the toilet bowl part to form a swirling flow, wherein one surface part out of a front surface part and a rear surface part of the toilet bowl part is provided with one end part of a front-rear direction of the toilet bowl part, and the flush toilet further comprises an upper guide part structured to be provided on a flush water path from the water discharge part to the one end part and guide at least a part of the flush water upward.