To solve a problem that a conventional hard fence used in hospitals and for children's beds to prevent children from falling from the beds during sleep has a risk of injuries by hitting the hands and legs against the fence due to rolling over or sleeping postures, is not adapted to beds and mattresses not equipped with a fence at the time of manufacture and to bottom mattresses spread on a floor or a Tatami since the fence is attached to limited places, and is obstructive when a user gets on and off the bed or uses the bed as a sofa.

A shrinkable soft material such as a bag with sponge or air inside is formed into a long protruded bar for a fence part 3. The fence 3 is placed at the end of the bed or the bottom mattress, and is covered with a sheet.