To enhance the crime preventing performance of an opening/closing device provided with an emergency opening/closing body integrally at the main opening/closing body such as a vestibule door.

A building entrance 12 formed in the external wall 11 of a building 10 is provided with the vestibule door 18. An emergency doorway 28 formed at a door body 24 of the vestibule door 18 is provided with an emergency door 31, and the emergency door 31 is provided with an emergency locking device 35. The door body 24 of the vestibule door 18 is provided with a door load sensor 44 detecting the load applied to the door body 24. A home server 41 determines whether the load is applied to the door body 24 based on a detection signal of the door load sensor 44, and determines whether the load is larger than a reference value if the load is applied. When the load is larger than the reference value, the home server 41 determines that the vestibule door 18 is in a non-openable state and performs locking control of the emergency locking device 35.

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