An emitter (120, 220) configured to be joined on an inner wall surface of a tube for carrying irrigation liquid at a position corresponding to a discharging port that communicates between inside and outside of the tube, the emitter (120, 220) being configured to quantitatively discharge the irrigation liquid in the tube from the discharging port to the outside of the tube, the emitter (120, 220) comprising: an intake part (150, 250) for intake of the irrigation liquid; a discharging part (180, 280) configured to be disposed to face the discharging port, and configured to discharge the irrigation liquid; a channel configured to connect the intake part (150, 250) and the discharging part (180, 280), and configured to distribute the irrigation liquid; and a pressure reducing channel disposed in the channel, and configured to reduce a pressure of the irrigation liquid taken from the intake part (150, 250), wherein the pressure reducing channel includes: a groove including an opening configured to be closed by the inner wall surface of the tube, and a plurality of protrusions protruding from both sides of an inner surface of the groove, the plurality of protrusions being alternately arranged in a flow direction of the irrigation liquid in the pressure reducing channel, characterised in that each of the plurality of protrusions includes a first protrusion and a second protrusion that are arranged next to each other in a depth direction of the groove, wherein the first protrusion is disposed on one side in the protrusion in the depth direction of the groove, wherein the first protrusion protrudes from the inner surface of the groove such that a tip end of the first protrusion crosses a center line of the groove in plan view, wherein the second protrusion is disposed on another side in the protrusion in the depth direction of the groove, and wherein the second protrusion protrudes from the inner surface of the groove such that a tip end of the second protrusion does not cross the center line of the groove in plan view. an intake part (150, 250) for intake of the irrigation liquid; a discharging part (180, 280) configured to be disposed to face the discharging port, and configured to discharge the irrigation liquid; a channel configured to connect the intake part (150, 250) and the discharging part (180, 280), and configured to distribute the irrigation liquid; and a pressure reducing channel disposed in the channel, and configured to reduce a pressure of the irrigation liquid taken from the intake part (150, 250), wherein the pressure reducing channel includes: a groove including an opening configured to be closed by the inner wall surface of the tube, and a plurality of protrusions protruding from both sides of an inner surface of the groove, the plurality of protrusions being alternately arranged in a flow direction of the irrigation liquid in the pressure reducing channel, a groove including an opening configured to be closed by the inner wall surface of the tube, and a plurality of protrusions protruding from both sides of an inner surface of the groove, the plurality of protrusions being alternately arranged in a flow direction of the irrigation liquid in the pressure reducing channel, characterised in that each of the plurality of protrusions includes a first protrusion and a second protrusion that are arranged next to each other in a depth direction of the groove, wherein the first protrusion is disposed on one side in the protrusion in the depth direction of the groove, wherein the first protrusion protrudes from the inner surface of the groove such that a tip end of the first protrusion crosses a center line of the groove in plan view, wherein the second protrusion is disposed on another side in the protrusion in the depth direction of the groove, and wherein the second protrusion protrudes from the inner surface of the groove such that a tip end of the second protrusion does not cross the center line of the groove in plan view.