A packing device includes: a packing box with an internal space capable of storing a packing target object with a protection target part, and with a packing box inner surface that is at least one inner surface positioned to face the protection target part of the packing target object; and a holding material configured to, when stored in the internal space together with the packing target object, maintain a space between the protection target part and the packing box inner surface by coming into contact with the packing box inner surface and a contact surface of the packing target object facing the packing box inner surface, while staying out of contact with the protection target part of the packing target object.