Abstract: The container device for cooking food is disclosed, the device comprising: a housing having an inner space defined therein, and a top cover, wherein non-cooked rice is received in the inner space, wherein the top cover is openable; a first hole defined in the top cover; an elastic steam filter disposed on an inner face of the cover to block the first hole, wherein the elastic steam filter is flexible and wherein the elastic steam filter is configured to allow passage of steam and to disallow passage of water, wherein the elastic steam filter includes nano-fibers; a support attached on the inner face of the cover to support the elastic steam filter; and a second hole defined in the support to vertically overlap the first hole.