A dispersing and defoaming device (10, 20) comprising: a casing having at least a liquid inlet opening that is an inlet for a liquid; a rotating body that is accommodated in the casing and pivotably attached to a rotating shaft from one end side of the rotating body; a liquid channel constituted of a space that has, on the other end side of the rotating body on an axis of the rotating shaft, a passage opening through which the liquid supplied from the liquid inlet opening passes, and that has, in the interior of the rotating body, a segment that is extended radially around the rotating shaft toward an outer side in a direction perpendicular to the rotating shaft and from the other end side of the rotating body toward the one end side of the rotating body in a direction of the axis of the rotating shaft and in which a shape of a cross section perpendicular to the rotating shaft is annular; and at least one connecting hole provided in the rotating body configured to connect the liquid channel with the exterior of the rotating body on a downstream side of the liquid channel; characterized by an interspace channel (190, 195) constituted of an interspace formed between the rotating body and the casing in a region closer to the one end side of the rotating body in the direction of the axis of the rotating shaft than the connecting hole is, wherein the casing has a first liquid discharge opening provided at a downstream side of an outlet opening of the interspace channel (190, 195) in a direction along the interspace channel; wherein the casing has a second liquid discharge opening provided at an upstream side of an inlet opening (191, 196) of the interspace channel (190, 195) in the direction along the interspace channel (190, 195). a casing having at least a liquid inlet opening that is an inlet for a liquid; a rotating body that is accommodated in the casing and pivotably attached to a rotating shaft from one end side of the rotating body; a liquid channel constituted of a space that has, on the other end side of the rotating body on an axis of the rotating shaft, a passage opening through which the liquid supplied from the liquid inlet opening passes, and that has, in the interior of the rotating body, a segment that is extended radially around the rotating shaft toward an outer side in a direction perpendicular to the rotating shaft and from the other end side of the rotating body toward the one end side of the rotating body in a direction of the axis of the rotating shaft and in which a shape of a cross section perpendicular to the rotating shaft is annular; and at least one connecting hole provided in the rotating body configured to connect the liquid channel with the exterior of the rotating body on a downstream side of the liquid channel; an interspace channel (190, 195) constituted of an interspace formed between the rotating body and the casing in a region closer to the one end side of the rotating body in the direction of the axis of the rotating shaft than the connecting hole is, wherein the casing has a first liquid discharge opening provided at a downstream side of an outlet opening of the interspace channel (190, 195) in a direction along the interspace channel; wherein the casing has a second liquid discharge opening provided at an upstream side of an inlet opening (191, 196) of the interspace channel (190, 195) in the direction along the interspace channel (190, 195).