To provide an outdoor built-up type dressing, shower and toilet room capable of being quickly, simply and easily conveyed, assembled and used and to contribute to the prevention of pollution in the aspect of environmental hygiene in an outdoor life.

A bayonet section to a hole of a pipe support bent at right angles to the end of a circular metal hoop hanging a curtain is provided, and by inserting it thereinto, a circular space 5 can be built up without impairing an effective space since one pipe set aside of a corner of the space 5 is erected.