Abstract: In a conventional solid-state laser device, uniformity of an excitation distribution around the axis of a solid-state laser medium is only considered, and symmetry of the excitation distribution in the optical axis direction of the solid-state laser device as a whole is not considered. Therefore, there has been a problem that it is difficult to generate a high-power and high-quality laser beam with high efficiency. In order to solve the problem, in the present invention, excitation modules 51, 52 of an even number is provided, along the optical axis of a solid-state laser beam 18, near the center of a resonator, and semiconductor lasers 21-28 serving as excitation light sources and solid-state laser media 11, 12 provided in the excitation module 51 or in the excitation module 52 are arranged to be symmetrical with respect to a virtual symmetry plane 61 located at a center gap between the excitation modules of the even number.