An emitter having a water intake part, a discharge part, a channel, and a pressure reduction channel. The pressure reduction channel includes a groove and a plurality of projections. The plurality of projections include first and second projections that are adjacent to one another in the groove depth direction. The first projections are positioned on one side in the depth direction of the groove, and when seen from a planar view, the tip ends thereof project from the inside surface of the groove so as to cross the center line of the groove. The second projections are positioned on the other side in the depth direction of the groove, and when seen from a planar view, the tip ends thereof project from the inside surface of the groove so as not to cross the center line of the groove.
