Provided is a package of an ion exchange membrane wound body that is easy to treat as waste, hard and strong, and also has water resistance. The package 1 can pack the ion exchange membrane wound body 10, and has a resin foam 30 having a density of 20 k Grapper square meter meter or more (JIS K 7222), a 5 perent compressive stress of 0.13 MPa or more (JI7220), and a bending stress (yield point) of 0.32 MPa or more (JI7221). Further, the average thickness of the resin foam 30 is 20 mm or more, and the thermal conductivity is 0.036 W/mk or less (JISA1412). Figure 2
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