PROBLEM TO BE SOLVED: To facilitate replacement of components.SOLUTION: A fluid sterilizing device according to one embodiment has a channel part, a light source part, and a lid part. The channel part has a channel for flowing a fluid formed thereon, and the channel is opened at its end face. The light source part irradiates the channel with ultraviolet rays. The lid part has the light source part installed thereon to cover the end face. The lid part has a fixing part fixed to the channel part in a detachable manner.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2019,JPO&INPIT【課題】部品の交換を容易にすること。【解決手段】実施形態に係る流体殺菌装置は、流路部と、光源部と、蓋部とを具備する。流路部は、流体を流すための流路が形成され、流路が端面で開放される。光源部は、流路へ紫外線を照射する。蓋部は、光源部が設置され、端面を覆う。また、蓋部は、流路部へ着脱可能に固定される固定部を有する。【選択図】図3