PROBLEM TO BE SOLVED: To provide a product at a low cost without requiring a high degree of machining accuracy and assembling accuracy with minimum members by opening a door body within a minimum range corresponding to the external form of a passing object person without forming an extra opening to minimize outside influence from the extra opening, and using a deformable covering sheet which conventionally exists in general, as the door body. SOLUTION: A plurality of opening/closing rods 3 movable in an opening/closing direction by drive mechanisms 6 are arranged at fixed spaces in an opening 2, and covering sheets 16 deformable in the opening/closing direction are connected and fixed to the opening/closing rods 3 to form the door body 1. Recognition sensors 13 capable of recognizing the external form of the passing object person 4 are arranged at least on the entrance side of the door body 1. Based on recognition signals of the recognition sensors 13, the opening/closing rods 3 that may contact the passing object person 4 are restrictively moved into non-contact positions to deform the covering sheets 16 to thereby form a passage opening 30 corresponding to the external form of the passing object person 4. COPYRIGHT: (C)2007,JPO&INPIT