To provide a bed capable of being housed by using a narrow space effectively and to provide a bed capable of protecting a sleeper from danger, for example, in case of a disaster like an earthquake, while sleeping.

In this bedstead housing device, a bed housing base 1 having a side surface and an upper surface and a bedstead 2 are divided into two or more parts, one bedstead 2a is disposed at the lower part in the bed housing base 1, the other bedstead 2b is disposed above or below the bedstead 2a, a rail 3 extending from a position of the bedstead 2b to a position adjacent to the bedstead 2a is provided on the side surface, and rollers fixed to feet protrudent from the bedstead 2b are fitted slidably to a guidepath in the rail 3.