To provide an intestine cleaning apparatus by which pure water for cleaning the intestine whose impurity concentration is equal to or lower than a prescribed concentration is obtained by removing impurities such as bacteria contained in raw water.

Filters 10 (a first filter 11, a second filter 12, and a third filter 13) filter city water introduced into an intestine cleaning apparatus. A heating unit 16 heats the filtered water. A reverse osmosis membrane device 18 generates pure water by treating the heated water by using a reverse osmosis membrane. A high-pressure control unit 19 pressurizes the pure water treated by the reverse osmosis membrane and deliver the pure water as pure water for cleaning a human intestine from an outlet 20.