To prevent a granular dehumidifying agent from being bitten in between a side wall part of a container body and a middle plate by preventing the occurrence of deflection of the side wall part even when shock due to falling or the like is transmitted to the side wall part.

A projecting part 15 which comes in contact with each of at least a pair of outer side faces 13, 14 facing each other among outer side faces of the middle plate 3 of a dehumidifying agent container 1 over a width direction of corresponding side wall parts 7, 8 and which becomes convex toward outside, is integrally provided. Swollen parts 16 of the side wall parts 7, 8 which are extruded toward outside by contact with the projecting part 15 are arranged to face each other.