A light source device includes: a first light emitting element configured to generate first light having intensity in a first wavelength band and having a first optical spectrum； a second light emitting element configured to generate second light having intensity in a second wavelength band adjoining to the first wavelength band and having a second optical spectrum overlapping with a part of the first optical spectrum； and a processor configured to, at a time of causing the first light emitting element and the second light emitting element to simultaneously perform light emission, cause the first light to be generated with a light amount adjusted according to a first mixed light amount which is a light amount of the second light mixed in the first wavelength band.
