To provide an arched ceiling structure in which nothing hinders in laying an exhaust duct to an attic space by omitting while hanging bolts for supporting an arched ceiling member relieving a blocking feeling by arching a ceiling of a corridor in housing.

The arched ceiling members 2 installed on the upper side of the corridor 1 in housing is supported by supporting members 8 fitted to partition walls 7, 7 partitioning the corridor 1 and habitable rooms. The exhaust duct 10 is laid in a substantially triangle space S formed by the under face of a slab 9, the arched ceiling member 2, and the partition wall 7.