Ion exchanger, water treatment device provided with same, and hot water supply device

An ion exchanger comprising:

• a porous positive ion exchanger having binder particles and particles of positive ion exchange resin which adheres positive ions, wherein the positive ion exchanger is formed into a sheet shape;
• and
• a porous negative ion exchanger having binder particles and particles of negative ion exchange resin which adheres negative ions, wherein the positive ion exchanger is formed into a sheet shape, wherein
• the positive ion exchanger includes a first positive ion exchange layer bonded to the negative ion exchanger to form the interface, and a second positive ion exchange layer laminated on a surface of the first positive ion exchange layer opposite from the interface,
• the negative ion exchanger includes a first negative ion exchange layer bonded to the positive ion exchanger to form the interface, and a second negative ion exchange layer laminated on a surface of the first negative ion exchange layer opposite from the interface,
• an ion exchange capacity of the negative ion exchanger is greater than that of the positive ion exchanger,
• wherein
• the ion exchange capacity of the second positive ion exchange layer is greater than that of the first positive ion exchange layer, and
• the ion exchange capacity of the second negative ion exchange layer is greater than that of the first negative ion exchange layer,
• a film thickness of the first positive ion exchange layer is thinner than that of the second positive ion exchange layer, and
• a film thickness of the first negative ion exchange layer is thinner than that of the second negative ion exchange layer,
• and
• the second positive ion exchange layer, the first positive ion exchange layer, the first negative ion exchange layer and the second negative ion exchange layer are laminated in order.