The inventive firing device (1) comprises a cartridge reception unit (11 ) in which each of several cartridges (3a to 3d) is provided with one propellant (132) and is interchangeably disposed in one reception chamber (9), and a cover part (7) closing the rear section of the device by means of which cartridges can be replaced. A fluid and/or powdered substance (14) that can be propelled by means of the triggered propellant (132) is stored in each cartridge. Triggering units for the cartridges (3a-3d) which can be activated sequentially by a trigger element (21) are disposed in the cover part (7). In order not to harm the user when replacing cartridges, the cartridge reception unit (11) and the top part of each cartridge are aligned with each other so as to seal the cartridge reception area (9) at least following the firing of the cartridge, thereby leaving no substantial quantity of the substance (14) in the firing device (1) outside the cartridges (3a-3d).