A fluid sterilization device includes: a housing that defines a flow passage extending in a longitudinal direction； a filter provided in the housing and extending in the longitudinal direction； and a light source including a light emitting device that emits ultraviolet light and irradiating a fluid passing through the filter and flowing in a laminar flow state with the ultraviolet light. The filter may be a hollow fiber filter. The light source may be provided to radiate ultraviolet light in the longitudinal direction.
