A cushioning material providing sufficient cushioning effect and an information storage device having the cushioning material are provided. The cushioning material has a space therein to cover a part of an inner housing coming in contact with an outer surface of the inner housing and projections formed toward an outer housing, each projection having a contact surface coming in contact with an inner surface of the outer housing, the contact surface being formed to extend along the inner surface. The information storage device is removably mounted on a device body and has a hard disk driving mechanism, a first housing for accommodating the hard disk driving mechanism, a second housing for accommodating the first housing, and a connector portion, wherein the first housing is supported by the cushioning material to have a distance between the first housing and the second housing.