PURPOSE: To provide the structure of the partitioned chamber of a vehicle which can be increase/decrease-reconstructed freely even after manufacture.

CONSTITUTION: A partitioned room structure consists of a floor part 10 consisting of a nearly rectangular floor surface 10a and an erection wall 10b which is continuously installed on the peripheral side part except the part corresponding to the inlet/exit part 7 of the floor surface, side partitioning 11, longitudinal partitioning 12, and a lateral partitioning 13 which are erecteed on the periphery of the floor part, entrance/exit part 7 formed on the partitioning, and a slide door 8. The inside equipment such as toilet and dressing table can be installed arbitrarily. Since these partitionings 11, 12, and 13 and the floor part 10 are formed perfectly separatedly from the structure body of a vehicle, these parts can be removed in simple manner or newly installed without reconstructing the frame assemblage of the structure body, and further a division chamber 6 can be increase/decrease-installed in simple manner even after manufacturing the vehicle.