A fluid sterilization apparatus 10 is provided with: a casing 12 for demarcating a flow channel 13 that extends in the longitudinal direction； a filter 40 provided inside the casing 12 and extending in the longitudinal direction； and a light source 50 with a light-emitting element 52 for emitting ultraviolet light for irradiating ultraviolet light toward the fluid flowing through the filter 40 in a state of laminar flow. The filter 40 may be a hollow fiber membrane filter. The light source 50 may be provided so as to irradiate ultraviolet light in the longitudinal direction.本發明提供一種流體殺菌裝置(10)，具備：框體(12)，用以劃分出沿著長邊方向延伸的流路(13)；過濾器(40)，其設置於框體(12)內，且沿著長邊方向沿伸；以及光源(50)，其具有發出紫外光的發光元件(52)，且朝向通過過濾器(40)並以層流狀態流動的流體照射紫外光。過濾器(40)亦可為中空纖維膜過濾器。光源(50)亦可以於長邊方向照射紫外光的方式所設置。
