To provide a partition with soundproof performance, which can be assembled and disassembled by a simple work, which can be freely removed and repositioned, and furthermore, in which a constituent member can be diverted as it is to other installation locations.

Side plates 7 of box-shaped bodies 3 are jointed together so that connection holes 11 are opposed to each other. Connection pins 19 are inserted into and fitted to the connection holes 11 opposed to each other. In the similar manner, the box-shaped bodies 3 are arranged overlapped horizontally and vertically and the connection pins 19 are fitted to the connection holes 11 of the side plates 7 jointed each other, so as to construct a wall-shaped partition 1. The partition 1 is arranged in such a way that no space is created among a floor F, a ceiling C, and a wall W of a room R. In such a way, the partition 1 can be easily assembled by vertically and horizontally overlapping the box-shaped bodies 3 and connecting those with the connection pins 19.