To dissolve problems that ice put in at the time of carrying perishable foods such as fish or the like damages them and wets the surroundings by melting and the waste pollution of the boxes of styrene foam.

Agar-like gel for which water is absorbed by a water highly absorbing resin beforehand and the perishable food are housed in a prescribed container or bag together, the agar-like gel is frozen thereafter or beforehand as needed and a preservation state at the time of carriage or the like is maintained.