Being production manner of the water absortion power polymer grain which designates the monomer which possesses, the acid radical of the ethylenic unsaturated as the foundation, suppresses smell, at that time the production manner where as for aforementioned acid radical 35 - 75mol% are neutralized, at the same time as for the aforementioned polymer grain with the chelate formation medicine coat are done.エチレン性不飽和の、酸基を有するモノマーを基礎とする、匂いを抑制する吸水性ポリマー粒子の製造方法であって、その際前記酸基は35~75mol%が中和されており、かつ前記ポリマー粒子はキレート形成剤でコーティングされている製造方法。