This emitter is provided with a water intake part, a discharge part, a flow path, and a check valve. The water intake part takes in an irrigation liquid. The discharge part discharges the irrigation liquid. The flow path connects the water intake part and the discharge part, and circulates the irrigation liquid. The check valve is provided to the flow path, opens the flow path for the irrigation liquid flowing towards the discharge part, and closes the flow path for fluid flowing back through the flow path from the discharge part. The check valve is provided with a valve body and a protrusion. The valve body includes: a fixed end part which is fixed to an inner wall of the flow path; and a free end part which is positioned at the opposite side to the fixed end part. The protrusion protrudes towards the downstream side of the flow path at the free end part.
