To enable a bed to be easily moved without hurting a person by covering L-shaped handles over three sides or the whole circumference of the inner periphery of a bottom mattress.

On three sides of the inner periphery part 2 of this bottom mattress, L-shaped handles 3, 3',... with lengths almost equal to the sides are attached. The L-shaped handles are made of synthetic resin and attached and fixed by wood screws. Since the L-shaped handles 3, 3',... are attached on three sides of beds like that and the beds are set so that the head board sides of the beds are usually made in contact with a wall face, the handles are attached on the necessary least three sides, and it is allowed to attach the handles on four sides depending on the setting position. The method to attach and fix the L-shaped handles is not limited to wood screws but allowed to use fitting or other ways.