Abstract: In a nozzle device a spray hole for spraying washing water and a pipe forming a first flow path that introduces the washing water to the spray hole is provided. Further, the spray hole is provided in a cover that surrounds the pipe. The cover is integrally formed of a cylindrical metal whose front end is closed. A space between an outer surface of the pipe and an inner peripheral surface of the cover member forming a second flow path that introduces the washing water to the spray hole. Further, the second flow path surrounds surface of the pipe in a circumferential direction of the cover member.

Abstract: Since the inner diameter of a flow-contracting portion continuously decreases toward a cylindrical swirl chamber, the velocity of flow of washing water flowing in the flow-contracting portion continuously rises. Since the inner diameter of the flow-contracting portion continuously decreases toward a spray hole, the velocity of flow of the washing water flowing in the flow-contracting portion continuously rises. Washing water supplied to one of flow paths in a two-flow path pipe is supplied to a flow path merger through a one-flow path pipe. The washing water supplied to the other flow path in the two-flow path pipe is supplied to the flow path merger after passing through a space between the one-flow path pipe and a nozzle cover.