PURPOSE: To carry out the blasting operation of an explosive safely and in the condition of a low explosion sound by providing shock absorbing materials for absorbing a shock caused at the time of explosion and a silencer for discharging high-pressure gas evolved at the time of explosion to the external side while suppressing the sound in a sound-proof container when the blasting operation of the explosive is carried out.

CONSTITUTION: In the case of the blasting operation of an explosive 1 such as an unnecessary bomb, etc., the explosive 1 is suspended in the air from a ling 2 in a sound-proof container via a wire and the like. Further, a lower mirror part 4 of the sound-proof container is charged with stones and rocks 4d or sand and the like, and a portion above a holding plate 3e comprising a porous plate in a top cover 3 is packed with the stones and rocks or the sand and the like 3d in the same manner. When the explosive 1 is ignited through a cable 7 for ignition under this condition, the scattering of broken pieces of the explosive 1 due to explosion is obstructed by the top cover 3, the lower mirror part 4 and side walls 5, and a shock due to explosion is absorbed by packed materials 3b to 5b, the stones and rocks 3d, 4d and the like. Furthermore, high-pressure gas evolved at the time of explosion is discharged while an explosion sound is suppressed by a silencer 6.