Sterilization device

The utility model relates to a sterilization device capable of effectively irradiating ultraviolet rays to fluid for sterilization. The sterilization device is provided with: a spherical storage part for accommodating a fluid; a supply port for supplying the fluid into the storage unit; a take-out port for taking out the fluid in the storage part; and a light source for irradiating ultraviolet rays. The storage portion includes a hemispherical first storage portion located on an upstream side and a hemispherical second storage portion located on a downstream side in a flow direction of the fluid at the supply port. The center of gravity of the supply port and the center of gravity of the take-out port are spaced apart when the supply port and the take-out port are projected onto a virtual plane that is orthogonal to the direction in which the inner surface of a supply flow path connected to the storage unit at the supply port extends. The light source is disposed such that the optical axis of the light source