A laser marker includes: a base including: a first guide portion; and a restriction part; a laser oscillator configured to emit laser light, the laser oscillator being removably mounted to the base by sliding in a mounting direction with being placed on the base, the laser oscillator including: a second guide portion extending in the mounting direction, the second guide portion being configured to be engaged with the first guide portion; a contact part configured to be in contact with the restriction part in a case the laser oscillator is mounted to the base; and an expander; and a scanner having an insertion part, the expander being inserted into the insertion part in a case the laser oscillator is mounted to the scanner, and the scanner being configured to scan the laser light emitted from the laser oscillator.