A portion container which can be unsealed easily by an extremely simple operation, and the lid of which can be opened easily with no possibility of scattering of the contents. The container body is constituted of a nonflexible tubular upper structure which is resistant to press deformation, and a flexible bottomed tubular lower structure extending downward from the lower edge of the upper structure and being susceptible to press deformation, wherein a press board connected rotatably with the upper structure and equipped with a cutter is provided vertically in the container. A lid plate is cut by pressing the press board from the outside to rotate the cutter.