An emitter provided with: a water intake part that communicates with the interior of a tube when the emitter is joined to the tube; a pressure-reducing flow channel part for forming a pressure-reducing flow channel; a flow rate adjustment part for adjusting the flow rate of the irrigation liquid in accordance with the pressure of the irrigation liquid inside the tube; and a discharge part that faces a discharge opening. The flow rate adjustment part has: a base; an accommodation part that accommodates the base; a communication hole that opens to the base and communicates with the discharge part; and a diaphragm part that is flexible and is disposed so as to be separated from the base, the diaphragm part approaching the base when the pressure of the irrigation liquid inside the tube is received.