The present invention provides a foam supply device in which water is not stirred in a chassis and therefore, resistance in the water pipe can be reduced, and foam can stably be radiated without deteriorating momentum of radiation.The foam supply device includes a water supply port 11, a water pipe 13 for introducing water from the water supply port 11, a drug supply pipe 14, a drug supply section 15, a gas supply pipe 17, a gas mixing section 19, a stirring section 60, a water pipe discharge port 12 and a radiation pipe 40. The water supply port 11 and the water pipe discharge port 12 are provided in the chassis 10. The water pipe 13, the drug supply pipe 14 and the drug supply section 15 are placed in the chassis 10. The stirring section 60 is placed downstream from the water pipe discharge port 12. Water which is not stirred by a stirring section 60 flows through the water pipe 13 placed in the chassis 10.
