To provide a collapsible packaging container which has a sufficient strength, can be easily built up, and presents various kinds of configurations.

In a semi-annular part group wherein a bonding groove having a width of the same dimension with the plate thickness is formed on a plate- form material, a vertical directional fixing part having a similar bonding groove is inserted from three directions through the bonding groove. Thus, a semi- spherical shell-form part P is formed. Two sets of the semi-spherical shell-form parts P and Q are horizontally combined, and a horizontal directional fixing part having a bonding groove in the same manner is inserted in the bonding groove on both ends of the vertical directional fixing part to fix the two parts. Then, the whole is built up.