Fluid sterilization device

A fluid sterilization device comprising:

• a light source apparatus configured to emit an ultraviolet ray;
• and
• a channel tube including a channel space that the ultraviolet ray from the light source unit enters, the channel space being a space through which a fluid flows, wherein
• the light source apparatus includes
• a mounting substrate, and
• an LED package mounted on the mounting substrate,
• the LED package includes
• a light emitting element configured to emit the ultraviolet ray,
• a package case accommodating the light emitting element, and
• a lid portion transmitting the ultraviolet ray from the light emitting element, disposed in contact with the channel space, and configured to conduct heat conducted from the light emitting element to a fluid flowing through the channel space,
• wherein the lid portion and the package case are exposed to the channel space, and
• wherein the channel tube includes an inlet at one end in an axial direction and an outlet on a side surface of the channel tube at another end surface of the channel tube and adjacent to the lid portion.