To provide an individual room system for curing mental patients capable of altering the use range division of an individual room according to the condition of a mental patient.

An internal space, the four sides of which are surrounded by enclosure walls 1a is divided into a living room 2, a toilet room 3 and a wash room 4 by partition walls 1b, 1c, and the enclosure wall 1a and the living room 2 are provided with lockable doors 5 increased in sound insulating ability.