DEHUMIDIFYING AGENT IN CONTAINER

PROBLEM TO BE SOLVED: To provide dehumidifying agent in a container having high moisture absorption and humidity conditioning capability which can be used in a long time.SOLUTION: A dehumidifying agent in a container includes: a container body 12 in which concrete sludge for absorbing a deliquescent inorganic salt and deliquescent liquid which is generated due to the moisture absorption of the deliquescent inorganic salt is stored; and a moisture permeable sheet 14 adhered to the container body such that an opening 12a of the container body 12 is covered. The concrete sludge is mixed with hydrochloric acid, and then turned into dried acid-treated concrete sludge. It is desired that the deliquescent inorganic salt is calcium chloride or magnesium chloride.