To solve the problems that on a single pillow, it moves during sleeping caused by a habit during sleeping to be about to slip out of the head and to burden the neck or to get hurt in the scruff of the neck and when one lies down on the side by turning over, it becomes too low to feel to hardly sleep and on a sponge mattress, the surface partly reaches the underside by body pressure and a part of the body is oppressed or one feels a pain caused by the hardness and when one is bedridden, one hardly turns over by one's own efforts to generate bedsore.

A bedsore preventive mattress 1 with a pillow 4 in which the mattress 1 with an appropriate thickness has a composition of a Quonset hut- shaped bottom layer B made of a highly elastic urethane foam and a top layer A made of a low elastic urethane foam and an auxiliary means 3 for turning- over on a bed (a means for changing height of the pillow) consisting of the Quonset hut-shaped curved face of the bottom layer B is provided and the body pressure is dispersed by the top layer A of the soft touch low elastic urethane foam, is provided.