Packaging material

1. A packaging material formed from a shock-absorbing plate material and stored in a packaging box together with a packaged article, the packaging material comprising:

a base portion formed along a flat plane; and

at least one shock absorbing portion surrounding three sides of a space along a main surface of the base portion, wherein

the shock absorbing portion includes:

a first vertical plate portion that continues to the base portion via a first bending portion, is erected on the main surface of the base portion, and has a first cut extending from a first side edge along the base portion, the first side edge being one of opposite side edges of the first vertical plate portion and extending along a standing direction of the first vertical plate portion;

a second vertical plate portion that continues to the base portion via a second bending portion and is erected on the first main surface of the base portion in such a way as to face the first vertical plate portion;

a third vertical plate portion that continues to the second vertical plate portion via a third bending portion formed along the standing direction of the second vertical plate portion, and extends from the third bending portion to a fourth bending portion extending along a second side edge that is the other of the opposite side edges of the first vertical plate portion;

a fourth vertical plate portion that continues to the third vertical plate portion via the fourth bending portion, and is overlaped on a surface of the first vertical plate portion that is opposite to another surface of the first vertical plate portion facing the second vertical plate portion; and

a hook-like portion that continues to the fourth vertical plate portion via a fifth bending portion formed along the first cut, is formed in a range of extending from the fifth bending portion, passing through the first cut and being overlaped on the main surface of the base portion, and has a second cut in which a bottom portion of the first cut of the first vertical plate portion is inserted.

2. The packaging material according to claim 1 , wherein

a cut is formed at an edge of the third vertical plate portion, the edge facing the main surface of the base portion, the cut extending from the fourth bending portion along the base portion, and

a width of the cut extending along the base portion is larger than a height of the first vertical plate portion in the standing direction from the base portion.

3. The packaging material according to claim 2 , wherein

an inclined edge is formed in an outer edge of the first vertical plate portion between the second side edge and a head top edge in the outer edge, the head top edge being located opposite to the first bending portion.

4. The packaging material according to claim 1 , wherein

the at least one shock absorbing portion is a pair of shock absorbing portions formed on opposite end portions of the base portion in a longitudinal direction thereof,

third vertical plate portions of the pair of shock absorbing portions are formed close to a center of the base portion in the longitudinal direction, and

when viewed from the center of the base portion, configurational elements of the respective shock absorbing portions are point symmetrically related with each other.