To provide a packaged product capable of storing a filled alkali agent-containing content stably for a long period of time.

The packaged product 10 has a rigid resin vessel 11 and the alkali agent-containing content 12 filled in the vessel. The rigid resin vessel 11 includes a cylindrical barrel 11a, a bottom 11b closing the lower end of the barrel, a shoulder 11c provided at the upper end of the barrel 11a, and a neck 11d provided at the upper end of the shoulder 11c, wherein a deposited film 15 is formed on the inner surface.