The present invention provides a stable salt of 3′-phosphoadenosine 5′-phosphosulfate (PAPS) and a production method therefor.The present invention is directed to a stable salt of PAPS (amine salt), which is formed between PAPS and an amine compound, and to a method for producing a stable salt of PAPS, which includes adding an amine compound to an aqueous PAPS solution in an amount by mole equal to or greater than that of PAPS, and lyophilizing the resultant solution.The present invention has first realized production of a solid-form PAPS salt having considerably improved stability through a very simple technique. Since the thus-produced amine salt of PAPS is very stable, the salt can be stored or employed without taking much care about decomposition thereof at ambient temperature.