To provide a fluid sterilization module, that does not cause leakage of fluid to be sterilized even when the assembly accuracy is low, and that has an excellent robustness.SOLUTION: The fluid sterilization module 1 comprises: an inner cylinder 21 forming a processing flow path 21d； a case part 22 accommodating the inner cylinder 21； an annular partition member 24 provided in tight adhesion between the outer peripheral surface of the inner cylinder 21 and the inner peripheral surface of the case part 22； an inflow side rectification chamber 26 which is a region on one end side of the inner cylinder 21 with respect to the partition member 24 among the cylindrical gap between the inner cylinder 21 and the case part 22； an outflow side rectification chamber 27 which is a region on the other end side of the cylindrical part with respect to the partition member 24 among the cylindrical gap between inner cylinder 21 and case part 22； an inflow part 4 for flowing the object into the inflow side rectification chamber 26； an outflow part 5 for flowing out the object from the outflow side rectification chamber 27； and a light emitting element 34a provided facing the opening on the other end side of the inner cylinder 21 and irradiating ultraviolet along the longitudinal direction toward the object passing through the processing flow path 21d.SELECTED DRAWING: Figure 2【課題】組み付け精度が低い場合であっても殺菌対象の流体の漏れが生じることなく、ロバストネスに優れた流体殺菌モジュールを提供する。【解決手段】流体殺菌モジュール１は、処理流路２１ｄを形成する内筒２１と、内筒２１を収容するケース部２２と、内筒２１の外周面とケース部２２の内周面との間に密着して設けられる環状の区画部材２４と、内筒２１とケース部２２との間の筒状の隙間のうちの区画部材２４よりも内筒２１の一端側の領域である流入側整流室２６と、内筒２１とケース部２２との間の筒状の隙間のうちの区画部材２４よりも筒状部の他端側の領域である流出側整流室２７と、流入側整流室２６に対象物を流入する流入部４と、流出側整流室２７から対象物を流出させる流出部５と、内筒２１の他端側の開口部に面して設けられ、処理流路２１ｄを通過する対象物に向けて長手方向に沿って紫外光を照射する発光素子３４ａと、を備える。【選択図】図２
