A laser crystal is formed on a substrate in a solid-state laser device. The laser crystal oscillates laser beam from a second end face when an excitation beam is projected to a first end face. An excitation beam emission element emitting the excitation beam is provided for the solid-state laser device. A waveguide path is formed on the substrate. The excitation beam is transmitted through the waveguide path. The waveguide path has a first end portion on which the excitation beam emitted by the excitation beam emission element impinges and a second end portion which opposes the first end face of the laser crystal. The excitation beam is emitted from the second end portion.