This emitter has an emitter main body comprising a first face, a second face disposed on the opposite side from the first face, and a side face connecting the first face and the second face； a water intake unit for taking in irrigation liquid disposed on the first face side； a discharge unit for discharging irrigation liquid disposed on the second face side； a flow path that connects the water intake unit and the discharge unit and allows the irrigation liquid to pass therethrough； and a protrusion disposed on the side face.
