To easily unseal a packaging body without taking any special means by forming first and second sealing parts provided on two opposing ridges for an unsealing guide for tearing the packaging body.

A packaging body 6 uses a bag body comprising first and second sealing parts 2 and 3 formed on two opposing ridges of four ridges, and a third sealing part 4 with one ridge out of the two remaining ridges consisting of a folding line, while the remaining ridge is opened. A fourth sealing part 5 is formed by joining the opened ridges with each other at an angle substantially orthogonal to the third sealing part 4 while an object to be packaged is stored inside the bag body. A pair of first and second triangles with the fourth sealing part 5 as a common bottom ridge, and a pair of third and fourth triangles with the third sealing part 4 as a common bottom ridge are formed, and the tetrahedral packaging body 6 with diagonal ridges of the triangles adjacent to each other in the peripheral direction connected to each other is formed. The first and second sealing parts 2 and 3 located on the perpendiculars of the first and second triangles are formed to be unsealing guides for tearing.

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