To provide an apparatus for cleaning water capable of enhancing cleaning performance.

The apparatus 100 for cleaning water is used in such a cleaning method that raw water containing an organic plluted component and nutritional salts of nitrogen/phosphorus at the least is cleaned by a slanted-soil-chamber method. soil chamber containers 10 each of which has a water-impervious bottom surface 11, water-impervious side faces 12 and an open upper surface and in each of which a carrier 15 having a cleaning function is packed, are piled up vertically in multiple stages so that water flows in the same direction in a plurality of soil chamber containers 10. It is preferable that the soil chamber containers 10 piled-up in multiple stages are divided into blocks B divided into a fixed length in the flowing direction of water so that the whole of each block B can be moved or replaced.