A solid-state laser device comprising: a laser rod; an excitation lamp which emits excitation light to the laser rod; a laser chamber which includes a frame body having an internal space storing the laser rod and the excitation lamp and transmits light emitted from the excitation lamp to the laser rod inside the frame body, a first portion of the frame body storing the excitation lamp having a first longitudinally extending hole portion having a diameter greater than the outer diameter of the excitation lamp and a second portion of the frame body storing the laser rod having a second longitudinally extending hole portion into which the laser rod is inserted; a pair of mirrors (114, 115) provided outside the laser chamber on the optical path of a light beam emitted from the laser rod; a boxlike housing to which the laser chamber and the pair of mirrors (114, 115) are attached; and a shielding lid of the housing which surrounds said first portion of the frame body such that said first portion projects above a portion of the shielding lid closest to the first portion of the frame body and which shields the internal space of the housing including the second portion of the frame body of the laser chamber attached to the housing, the pair of mirrors (114, 115), and the optical path of the light beam emitted from the laser rod from the outside, wherein the first portion of the frame body of the laser chamber further has an O ring attachment portion in which an O ring having an outer diameter greater than the diameter of the first hole portion is attached at an end portion of the first portion of the frame body of the laser chamber in a longitudinal direction, the excitation lamp is able to be removed from and inserted into the laser chamber intermediated by the first hole portion, and the thickness of a thin film first region of the shielding lid covering at least part of the optical path of the light beam emitted from the second hole portion is smaller than the thickness of a second region of the shielding lid which is further away than the first region from said first portion of the frame body in the longitudinal direction extending from the first portion of the frame body of the laser chamber to a side wall of the housing. a laser rod; an excitation lamp which emits excitation light to the laser rod; a laser chamber which includes a frame body having an internal space storing the laser rod and the excitation lamp and transmits light emitted from the excitation lamp to the laser rod inside the frame body, a first portion of the frame body storing the excitation lamp having a first longitudinally extending hole portion having a diameter greater than the outer diameter of the excitation lamp and a second portion of the frame body storing the laser rod having a second longitudinally extending hole portion into which the laser rod is inserted; a pair of mirrors (114, 115) provided outside the laser chamber on the optical path of a light beam emitted from the laser rod; a boxlike housing to which the laser chamber and the pair of mirrors (114, 115) are attached; and a shielding lid of the housing which surrounds said first portion of the frame body such that said first portion projects above a portion of the shielding lid closest to the first portion of the frame body and which shields the internal space of the housing including the second portion of the frame body of the laser chamber attached to the housing, the pair of mirrors (114, 115), and the optical path of the light beam emitted from the laser rod from the outside, wherein the first portion of the frame body of the laser chamber further has an O ring attachment portion in which an O ring having an outer diameter greater than the diameter of the first hole portion is attached at an end portion of the first portion of the frame body of the laser chamber in a longitudinal direction, the excitation lamp is able to be removed from and inserted into the laser chamber intermediated by the first hole portion, and the thickness of a thin film first region of the shielding lid covering at least part of the optical path of the light beam emitted from the second hole portion is smaller than the thickness of a second region of the shielding lid which is further away than the first region from said first portion of the frame body in the longitudinal direction extending from the first portion of the frame body of the laser chamber to a side wall of the housing.