PURPOSE: To wirelessly initiate without supplying electric energy by converting an explosion impact wave generated when adjacent explosives are initiated at a predetermined interval to the electric energy, and igniting the igniter by the energy.

CONSTITUTION: The explosion impact pressure from adjacent explosive is input to a converter 1, and the generated electric energy is charged in an ignition storage capacitor 11 via a diode 10. A controller 13 controls the time until sufficient energy for igniting is stored in the capacitor 11. When a switching unit 12 is closed by the trigger signal from the controller 13, the energy stored in the capacitor 11 is supplied to an ignition resistance wire 3 to ignite the ignition explosive 4, and then the explosive 6 charged in an inner tube 5 is then exploded to initiate a base charge 7. Thus, the explosives charged in initiating holes can be wirelessly initiated without supply of the energy.