An emitter for quantitatively discharging irrigation liquid in a tube for distributing the irrigation liquid from a discharge port communicating between an inside and an outside of the tube when the emitter is joined to an inner wall surface of the tube at a position corresponding to the discharge port, the emitter comprising: an intake part for receiving the irrigation liquid in the tube; a liquid receiving amount regulating part for regulating a flow rate of the irrigation liquid received from the intake part; a pressure reduction channel for allowing the irrigation liquid supplied from the liquid receiving amount regulating part to flow therethrough while reducing a pressure of the irrigation liquid; a discharge rate regulating part for regulating the flow rate of the irrigation liquid supplied from the pressure reduction channel in accordance with a pressure of the irrigation liquid in the tube; and a discharge part to which the irrigation liquid, having a flow rate regulated by the discharge rate regulating part, is supplied, the discharge part being to be facing the discharge port, characterized in that the liquid receiving amount regulating part includes a valve element which extends from a fixed end of a channel of the irrigation liquid in the emitter and opens to a downstream side when receiving a pressure of the irrigation liquid on an upstream side, and a fixed part disposed at a position adjacent to the valve element in plan view, the valve element includes a thin part having flexibility and extending from the fixed end, and a thick part extending from the thin part, the thin part bends and the valve element opens to the downstream side when a pressure of the irrigation liquid on an upstream side of the liquid receiving amount regulating part is equal to or higher than a predetermined value, each of the valve element and the fixed part has a circular sector shape in plan view; and the valve element and the fixed part are alternately disposed in a circumferential direction in plan view. an intake part for receiving the irrigation liquid in the tube; a liquid receiving amount regulating part for regulating a flow rate of the irrigation liquid received from the intake part; a pressure reduction channel for allowing the irrigation liquid supplied from the liquid receiving amount regulating part to flow therethrough while reducing a pressure of the irrigation liquid; a discharge rate regulating part for regulating the flow rate of the irrigation liquid supplied from the pressure reduction channel in accordance with a pressure of the irrigation liquid in the tube; and a discharge part to which the irrigation liquid, having a flow rate regulated by the discharge rate regulating part, is supplied, the discharge part being to be facing the discharge port, characterized in that the liquid receiving amount regulating part includes a valve element which extends from a fixed end of a channel of the irrigation liquid in the emitter and opens to a downstream side when receiving a pressure of the irrigation liquid on an upstream side, and a fixed part disposed at a position adjacent to the valve element in plan view, the valve element includes a thin part having flexibility and extending from the fixed end, and a thick part extending from the thin part, the thin part bends and the valve element opens to the downstream side when a pressure of the irrigation liquid on an upstream side of the liquid receiving amount regulating part is equal to or higher than a predetermined value, each of the valve element and the fixed part has a circular sector shape in plan view; and the valve element and the fixed part are alternately disposed in a circumferential direction in plan view.