The invention relates to a laser device having a laser arranged in a housing (21), a lens (31) that is positionally adjusted thereto, and a lens holder (1) that is composed of at least two lens holder parts (2a, 2b, 2c) one after the other in the propagation direction (3) of the laser beam for the purpose of length adjustment. The length of the lens holder is adjusted by selecting a relative position that defines the spacing between the lens holder parts perpendicularly to the propagation direction in conjunction with end faces of the lens holder parts oriented obliquely to the propagation direction. One of the lens holder parts (2c) can be designed as a tubular body that can be pushed onto the housing (21).