A sterilization device includes: a processing chamber in which a fluid passing through a straightener flows in a first direction, the straightener being provided at an inlet of the processing chamber； a plurality of light emitting devices arranged in an array on a plane facing the straightener in the first direction, sandwiching the processing chamber, and irradiating the fluid in the processing chamber with ultraviolet light； a light source chamber that houses the plurality of light emitting devices inside； and a discharge path provided to the side of the light source chamber and allowing the fluid passing through the processing chamber to flow in the first direction.
