A solid-state laser device (1, 2) comprising: a linear resonator in which an output mirror and a rear mirror are disposed on a straight line; a laser rod disposed on an optical path of the resonator; optical members at least including a Q-switch; and a rod-shaped excitation light source that extends parallel to the laser rod and is configured to emit excitation light to excite the laser rod, wherein the excitation light source is located at a position that is as close to the optical path as possible within a range where a lower end position thereof does not overlap the optical path, wherein the resonator, the laser rod, and the optical members are provided on a common base and are contained in a housing having the base as a portion, wherein a holding part is provided to hold the excitation light source parallel to the laser rod on a side of the laser rod opposite to the base, wherein the optical members including the Q-switch are disposed between the laser rod and the rear mirror, wherein an upper end position of the output mirror is at a position lower than a lower end position of the excitation light source held by the holding part, with the base as a reference, and wherein the holding part holds the excitation light source so as to be capable of being inserted and extracted with respect to the output mirror side in a longitudinal direction of the excitation light source, wherein no optical member is provided between the laser rod and the output mirror, wherein the output mirror is formed such that a reflective coating film of a resonator surface of the output mirror is provided up to the upper end position, thereby allowing longitudinal extraction of the excitation light source to the side of the output mirror. a linear resonator in which an output mirror and a rear mirror are disposed on a straight line; a laser rod disposed on an optical path of the resonator; optical members at least including a Q-switch; and a rod-shaped excitation light source that extends parallel to the laser rod and is configured to emit excitation light to excite the laser rod, wherein the excitation light source is located at a position that is as close to the optical path as possible within a range where a lower end position thereof does not overlap the optical path, wherein the resonator, the laser rod, and the optical members are provided on a common base and are contained in a housing having the base as a portion, wherein a holding part is provided to hold the excitation light source parallel to the laser rod on a side of the laser rod opposite to the base, wherein the optical members including the Q-switch are disposed between the laser rod and the rear mirror, wherein an upper end position of the output mirror is at a position lower than a lower end position of the excitation light source held by the holding part, with the base as a reference, and wherein the holding part holds the excitation light source so as to be capable of being inserted and extracted with respect to the output mirror side in a longitudinal direction of the excitation light source, wherein no optical member is provided between the laser rod and the output mirror, wherein the output mirror is formed such that a reflective coating film of a resonator surface of the output mirror is provided up to the upper end position, thereby allowing longitudinal extraction of the excitation light source to the side of the output mirror.