PURPOSE: To provide a solid laser device which can set laser process conditions corresponding to an object to be processed at processing with a laser and which can process in an optimum manner without an excessiveness in energy or a shortage of energy for an optimum laser process, in particular, in laser welding, laser cutting, or the like at laser beam machining.

CONSTITUTION: This embodiment has a direct current power source circuit 1 comprising a constant voltage circuit and a capacitor 2 for supplying constant energy, and is also provided with a first transistor 3 as a switching element for supplying charge energy for a flash lamp 5 and a second transistor 4 as a switching element for making constant a charge voltage.