Abstract: A method of manufacturing a functional hollow structural member having a structural member having a hollow part, and functional means disposed on the inside surface of the hollow part, comprising the steps of injecting a molding material into a molding die, injecting a gas and a functional substance into the molding material to form a hollow part in the molding material, forming functional means inside of the hollow part, and forming a structural member by solidifying the molding material. As the functional means, a layer having a magnetic function, conductive function, or antibacterial function is used.

Abstract: A vibration or shock absorbing member which is composed of a material capable of effecting injection molding such as plastics, rubber, ceramics, metallic powder mixed and kneaded with a specified binder, or glass powder mixed and kneaded with a specified binder, and includes an integral structure, a plurality of protrusions formed at least on one main flat surface of the integral structure, and a plurality of independent hollow portions provided symmetrically or in an aligned state within the integral structure through intersecting partition walls. Such integral structure is molded as one unit by one-shot molding (molding at one time) or by a single molding die for expanding the range of selection for materials and spring constants so as to achieve freedom in the choice of shapes and reduction in weight.