PURPOSE: To improve the control of entrance and exit by holding each door component member on a rotary shaft which is arranged on one side in longitudinal wall section on one side in lateral direction slidably, and making it possible to engage and disengage guide bodies on both side end parts of the component member with a guide rail.

CONSTITUTION: A rotary shaft 4 is arranged on one side on a first longitudinal wall section 21 side of one of the first and second longitudinal wall sections 21, 22 on both sides of a doorway 1, and space between the shaft 4 and second longitudinal wall section 22 allows one person who comes in and out to pass. Next, a plural number of door component members 51, 52 are held on the shaft 4 at equal angle at 90°C in lateral direction slidably. Then, a guide body 8 mounted on both side end sections of the members 51, 52 is formed in such a way that it can engage or disengage with a guide rail 11. When the door component members 51, 52 are guided and moved due to the guide rail 11, the members 51, 52 are advanced from and retracted to the rotary shaft 4 to open or close the inlet and outlet 1. Thus, it is possible to improve the control of entrance and exit.