To provide an ion exchange apparatus capable of easily and certainly backwashing the whole of a strong electrolyte ion exchange resin without transferring the strong electrolyte ion exchange resin.

The ion exchange apparatus is constituted of a weak electrolyte ion exchange resin bed charged and formed in a resin packing column, the strong electrolyte ion exchange resin bed provided under the weak electrolyte ion exchange resin bed through a shielding plate, a supply and discharge means of water to be treated for allowing the water to be treated to flow in the resin packing column from the upper part thereof as a descending flow to allow the same to flow out of the lower part of the resin packing column, a regeneration agent supply and discharge means for allowing a regeneration agent to flow in the resin packing column from the lower part thereof as an ascending flow to allow the same out of the upper part of the resin packing column, floating particles, which float with respect to water, charged in the floating particle filling part formed above the strong electrolyte ion exchange resin bed, a storage part for temporarily storing floating particles and a transfer means for transferring the floating particles charged in the floating particle filling part to the storage part to return them to the floating particle filling part. The whole of the strong electrolyte ion exchange resin can be backwashed easily and certainly by this ion exchange apparatus.

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