To provide a functional office structure having business functions as an office even if a temporarily sleeping bed 44, a book shelf 23, a locker 45, and a desk 22 are installed in the narrow office 11 formed by partitioning the first story of a building into multiple booths and also having a sanitary, economical, and aesthetic business environment.

In this office structure, a part of a ceiling 35 forming the office is opened, a ceiling rear space port is formed, a ceiling rear space 33 is formed integrally with an indoor space, and a three-dimensionally constructed multi-purpose unit furniture 13 is installed in the integrated office space 12.