PURPOSE: To prevent defect such as filament breakage, etc., due to vertical movement, etc., during storage/transport of magnetrons from happening, and improve the workability at the time of placing/taking out of contents by a method wherein on the bottom surface of an interior base, a protruding part which is fitted in a hole is provided, and when storage boxes are stacked in several stages, magnetrons which are stored in the lower stage are held by the protruding part.

CONSTITUTION: On the bottom of an upper surface opened box 1 made of plastic, etc., in which a plurality of magnetrons are stored, holes 11 are provided. In this case, the number and shape of the hole 11 are not specially limited. Also, on the upper surface of an interior base 5 with cushioning characteristic made of foamed plastics, etc., which is fitted in the box 1, recessed parts 51 in which magnetrons 2 are stored while being aligned are provided, and on the bottom surface of the interior base 5, protruding parts 52 which correspond with the holes 11 on the bottom of the box 1 are provided. When the storage box is used, after align-storing magnetrons 2' in recessed part 51' on the upper surface of an interior base 5' which is fitted in a box 1', the box 1 in which the interior base 5 is fitted is placed on the box 1', and thus, the magnetrons 2 ' stored in the box at the lower stage are held by the protruding parts 52 on the interior base 5.