PROBLEM TO BE SOLVED: To provide a sterilization device of toilet bowl capable of efficiently sterilizing in a region including a contact line between a water seal surface and an inner surface i.e. a waterline of a toilet bowl body.SOLUTION: The sterilization device of toilet bowl includes at least: ultraviolet transmission means 4 which forms a part of a toilet bowl body 1 ultraviolet generation means 5 which is incorporated with the toilet bowl body 1 inside thereof which is formed by the ultraviolet transmission means 4 to generate and output ultraviolet toward the ultraviolet transmission means 4 and control means 6 that controls an ultraviolet generation operation and generation timing of the ultraviolet generation means 5. The ultraviolet transmission means 4 forms a peripheral region inner/outer sides of a water seal 2 forming a generally ring shape including a waterline 3 which is a contact line between the surface of the water seal 2 in the toilet bowl body 1 and the inner surface of the toilet bowl body 1.COPYRIGHT: (C)2015,JPO&INPIT【課題】便器の除菌装置に関し、特に便器本体内の封水表面と同本体内面との接触線、いわゆる喫水線を含む周辺領域の除菌を効率よく実現できる便器の除菌装置を提供する。【解決手段】便器本体1の一部を形成する紫外線透過手段4と、紫外線透過手段4が形成する便器本体1の近傍内部に内蔵されると共に動作することにより紫外線を発生して紫外線透過手段4に向けて出力する紫外線発生手段5と、紫外線発生手段5の紫外線発生動作並びに発生タイミングを制御する制御手段6とを少なくとも備え、さらに紫外線透過手段4にて、便器本体1内の封水2表面と同本体1内面との接触線である喫水線3を含んで略リング形状となる封水2内外の周辺領域を形成する。【選択図】図1