A clothes treatment apparatus is disclosed. The clothes treatment apparatus includes a case defining the external appearance and having an open front, a first clothes treatment chamber defining a space in the case to treat clothes using steam or air circulation, a second clothes treatment chamber defining a space at one side of the first clothes treatment chamber in the case to remove wrinkles from clothes by applying pressure to the clothes, a machine chamber provided in the case to spray steam to or circulate air through the first clothes treatment chamber or the second clothes treatment chamber, and a partition plate configured to be movable to a position for closing the second clothes treatment chamber so that the second clothes treatment chamber is separated from the first clothes treatment chamber and to the open front of the case to open the second clothes treatment chamber.