Local excessive laser radiation is prevented, and uniform laser radiation is performed in a target treatment region. Provided is a laser ablation device (10) including: a light source (17A) that emits laser light for cauterizing an affected area a fiber (15) that is provided in an insertion portion (11) and that guides the laser light emitted from the light source to radiate the laser light from an insertion-portion distal end and a first drive unit (16) that is provided on the fiber and that vibrates the fiber with a first period.
