To provide a structure of a container which is deformable and is filled with a foodstuff wherein a protruding piece is not formed on a base of the container, the foodstuff can be easily and quickly removed out of a container body even when force applied to the container is relatively small and an amount of deformation is small, and further bad effects in a structure formed with the protruding piece are prevented.

One or a plurality of recessed grooves 14, 14a, 14b, 14c and 14d are appropriately selectively formed in a series or intermittently on internal side faces 12a in the container body 8 which has an approximately circular or approximately polygonal opening 9 and is deformable, an internal bottom face 13a, regions 12b adjacent to each other on the internal side faces 12a, regions 12c adjacent to each other on the internal bottom face 13a or at a middle position of side faces 12 of the container body 8. The dented grooves 14 to 14d are formed of grooves having an approximately arcuate cross section or an approximately polygonal cross section. The structure of the container is integrally formed with a teeth extraction like geta (clog) on a lower surface 13b of a base 13 of the container body 8.