The present invention provides a water gel in the form of, for example, flakes with which the defects, such as malodor, discoloration, and hydration, associated with conventional water gels have been eliminated. The water gel 1 according to the present invention is provided by using, as raw materials, an alkaline solution, and a monomer, such as acrylic acid, acrylate, or acrylamide, which is added to the alkaline solution, the content of the monomer being approx. 10% to 20% making a pH-value adjustment adding a crosslinking agent, a photoprimer and a photosensitizer and making a UV photo-curing treatment at a wavelength of 320 nm to 400 nm for photocrosslinking the monomer to produce a water gel in the form of, for example, flakes.
