To provide a cask in which shock-absorbing characteristics hardly change.SOLUTION: A cask comprises: a transport container for housing housed objects; and a buffer that includes a porous body and is mounted on the transport container. The porous body contains a synthetic resin. When it is defined that an energy absorption characteristic value is equal to an average compressive stress[MPa]xa crushing rate[ percent ]/100, the energy absorption characteristic value is 0.42 or more.SELECTED DRAWING: Figure 1
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