NOVELTY - A liquid-absorbable resin is formed by crosslinking polymer (A) (20-100 weight%). The polymer (A) contains a structural unit having functional group chosen from carboxyl group and sulfonic acid group. The proton of carboxyl group and sulfonic acid group is substituted by onium cation and/or alkali-metal cation. The liquid-absorbable resin has melt viscosity of 100-100000 Pa.second in shear rate of 100 seconds-1 at 160 degrees C and liquid absorption of 10-1000 g/g with respect to ion-exchange water. The onium cation substitutional rate of the polymer (A) is 30-100 mol%.    USE - Liquid-absorbable resin is used for manufacturing liquid-absorbable resin molded products (claimed) e.g. film, fiber and foam sheet. Uses include but are not limited to water sealant for carrier of water-swellable rubber, antistatic agent, surgical dressing, gel electrolyte film, solid fuel, battery binder, deodorizer, water-absorptive binder and telecommunication cable.    ADVANTAGE - The liquid-absorbable resin provides molded product having excellent handleability.    DETAILED DESCRIPTION - A liquid-absorbable resin is formed by crosslinking polymer (A) (20-100 weight%). The polymer (A) contains a structural unit having functional group chosen from carboxyl group and sulfonic acid group. The proton of carboxyl group and sulfonic acid group is substituted by onium cation and/or alkali-metal cation. The liquid-absorbable resin has melt viscosity of 100-100000 Pa.second in shear rate of 100 seconds-1 at 160 degrees C and liquid absorption of 10-1000 g/g with respect to ion-exchange water. The onium cation substitutional rate of the polymer (A) is 30-100 mol%, satisfying the relation: onium cation substitutional rate (mol%)=(number-of-moles of inner onium cation)/(number of moles of sum total of functional group in which proton of inner carboxyl group and sulfonic acid group is substituted with onium cation and/or alkali-metal cation)x 100. An INDEPENDENT CLAIM is included for manufacture of liquid-absorbable resin molded product, which involves molding the liquid-absorbable resin and crosslinking by melting the resin.