This paper states about the possibility of multiplying the underground shopping mall. At present, “an underground shopping mall is limited to 1 story.” And this rule limits a spatial design to the direction of the height. So, thinking that the multiplicity of the underground shopping mall becomes possible, it describes the influence appeared about the space environment side, the business income and costs side, the safety and protection against disaster side. As a result, multiplying the underground shopping mall can be realized by the present construction technique and the protection technique against disasters. Moreover, it provides very comfortable space.