A sterilization device includes a treatment chamber provided with multiple inlet ports and an outlet port, and multiple light sources that irradiate a fluid flowing within the treatment chamber with ultraviolet light. Each of the multiple light sources is disposed so as to emit ultraviolet-light toward a fluid flowing closer to the corresponding inlet port than to the outlet port. The treatment chamber may be of a shape extending in the longitudinal direction from a first end surface toward a second end surface. The multiple light sources may include the first light source disposed on the first end surface and the second light source disposed on the second end surface.
