PROBLEM TO BE SOLVED: To provide a packaging container for microwave oven heat cooking which can cover the whole food for microwave oven heat cooking to hygienically preserve the food, can prevent steam generated from the food from being filled inside when irradiated with microwave by the microwave oven, and can make burned stripes on the food to obtain a crispy feeling of eating by the microwave oven heat cooking even though it is a container covering the whole food.SOLUTION: Slits 13 each with a convex shape toward a descending inclination direction are provided on the outer box upper face plate 5 of an outer box 2, and tongue pieces 14 which are flush to a curved inclination face of the outer box upper face plate 5 and can be sprung up, are formed. The steam spouted from the food 4 for microwave oven heating cooking when the microwave oven heating cooking is performed, passes through a passage 23 for the steam between a covering lid part 15 of a base paper 3 and side plate parts 15a and 16a of a receiving tray part 16, and the tongue pieces 14 spring up by increase in pressure in a body part 8 to open gaps for venting the steam, and the steam passes through the gap in the body part 8.COPYRIGHT: (C)2008,JPO&INPIT【課題】電子レンジ加熱調理用食品全体が覆われて衛生に保存でき、電子レンジによりマイクロ波照射時に食品から発生する蒸気を内部にこもらないようにし、食品全体を覆っている容器でありながら、電子レンジ加熱調理により食品に焼き目が付いてパリパリ感の食感が得られるようにする。【解決手段】外箱2の外箱上面板5に、下り傾斜方向に向けて凸の形状にしてスリット13を設けて、外箱上面板5の曲がり傾斜面と面一にしてかつ跳ね起き可能な舌片14を形成し、電子レンジ加熱調理時に電子レンジ加熱調理用食品4から噴出する蒸気が台紙3の被せ蓋部15と受け皿部16の側板部分15a、16aの間における蒸気用通路23を通り、胴部8内の圧力上昇により舌片14が跳ね起きして蒸気抜きの隙間を開口して、胴部8内の蒸気が隙間を通る構成とした。【選択図】図2
