A beam dump apparatus may include: an attenuator module; a beam dump module; and a control unit. The attenuator module includes: a first beam splitter provided inclined with respect to the optical axis of a laser beam at a first angle; a second beam splitter provided inclined with respect to the optical axis at a second angle; a first beam dumper provided such that the laser beam from the first beam splitter enters thereinto; a second beam dumper provided such that the laser beam from the second beam splitter enters thereinto; and a first stage that causes the beam splitters to advance into and retreat from the optical path. The beam dump module includes: a mirror; a third beam dumper provided such that the laser beam from the mirror enters thereinto; and a second stage that causes the mirror to advance into and retreat from the optical path.