To effectively prevent the deposition of dust in a clean room.

A support for the clean room is used mainly for a partition for the clean room, and has basic constitution with an internal cylindrical body 20 extending in the hole-center direction, external cylindrical bodies 30 covered on the internal cylindrical body 20 under a separate state and connecting strips 40 extending in the longitudinal direction interposed among the external cylindrical body 30 and the internal cylindrical bodies 20. Screwing bands 60 extending in the longitudinal direction at places being out of the connecting strips 40 are formed to the external cylindrical bodies 30, and the size of the screwing bands 60 is set in thickness in which a screw hole 61 can be bored by pushing operation by manual operation using a manual tool.