To accelerate the convections of rice and cooking water at the time of a rice cooking, and suppress a rice cooking mark and a heating mark when rice is cooked by a microwave oven by forming the internal side of the side surface section extending to the bottom surface into an arc-shape of which the radius is specified, and setting a ratio of the height from the internal lowermost section of the bottom surface to the upper end section of the side surface, and the diameter at the internal upper end section of the side surface within a specified range.
This container 11 is equipped with a bottom surface 21 which is circular when seen from the top, an approx. bell-shape side surface 31 which is erected from the bottom surface 21 in a manner to be tapered out, and an annular flange 41 which is projected from the upper end section outer periphery of the side surface 31, and is integrally molded of a heat-resistant plastic. The bottom surface 21 of the container 11 becomes a flat surface shape, and the inside of the side surface section 31a is formed into an arc-shape of which the radius r is 18-32 mm. Also, a ratio h1/d1 of the height h1 from the inside of the bottom surface 21 to the upper end section of the side surface 31, and the diameter d1 at the internal upper end section of the side surface 31 is set 0.30-0.50. For the container 11, a laminate having a single layer body of a plastic layer, and at least one layer of a plastic having a gas barrier property, is used. By this constitution, a rice cooking mark, and a heating mark can be suppressed.
MAEZAWA TSUTOMU
KOKUNI MORITOSHI
YOSHIHARA KATAMICHI
FUJIMORI KOGYO CO
NITTO ARIMAN KK
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