The present invention addresses the problem of providing: a sterilization device capable of sterilizing and disinfecting to eliminate an organism to be sterilized from the surface of biological tissues while mitigating damage to animal cells, and of ensuring that an irradiation site can be made visually identifiable and thus permit a full awareness of an ultraviolet irradiation area, by means of irradiating with both ultraviolet light for UV sterilization and visible light having high color rendering properties； and a sterilization method. This sterilization device is characterized by: being provided with a light source unit for emitting light having a continuous spectrum over a wavelength range from 200 nm to 500 nm, and a filter which cuts light within a wavelength range of 230 nm (exclusive) to 400 nm and attenuates light within a wavelength range of 400 nm (exclusive) to 500 nm； and the light that passes through the filter being emitted at a living body. The filter preferably satisfies the following condition: for the light that passes through the filter, the ratio of light within a wavelength range of 400 nm (exclusive) to 500 nm to light within a wavelength range of 200 nm to 230 nm is 0.18 or less.本發明的課題，係提供可一邊抑制對於動物細胞的危害，一邊對存在於生體組職的表面上之殺菌對象生物進行殺菌‧消毒，而且，可藉由與UV殺菌的紫外線一起照射高演色性的可視光，確實視認照射對象部位，可確實掌握紫外線照射範圍的殺菌裝置及殺菌方法。本發明的殺菌裝置，其特徵為具備放射涵蓋200nm～500nm的波長區域具有連續光譜之光線的光源部，與截斷超過230nm～400nm的波長區域之光線，使超過400nm～500nm的波長區域之光線衰減的濾光器；透射前述濾光器的光線被照射至生體。前述濾光器，係透射該濾光器的透射光中，200nm～230nm的波長區域之光線相對於超過400 nm～500nm的波長區域之光線的比率為0.18以下者為佳。
