A superabsorbent polymer (10) includes polymer particles (100), surface cross-linking agents and particles (102) made of silicon-containing inorganic salt. The polymer particles (100) have cross-linking inside the polymer particles (100). The surface cross-linking agents are covalently bound to the surface of the polymer particles (100) so as to constitute a surface cross-linked region (104) at the surface of each of the resin particles (100), and the particles (102) made of silicon-containing inorganic salt cover the surface of each of the polymer particles (100).