The present invention expands, by using a surface-area expansion means (30), the surface area of a stabilized chlorine dioxide solution (10) which is irradiated with ultraviolet rays (71) and stored in a storage tank (20), quickly generates a chlorine dioxide gas, and discharges the gas to the exterior of the vessel by using a ventilation means (61). The chlorine dioxide gas is stably discharged by irradiating the stabilized chlorine dioxide liquid with ultraviolet rays. It is possible to adjust the concentration of the generated chlorine dioxide gas by adjusting the concentration of the stabilized chlorine dioxide solution (10) and the ultraviolet ray (71) output. By directly discharging a low-concentration chlorine dioxide gas that is safe for people into the interior of a room in which people live, it is possible to sterilize the interior of the room from corner to corner. When the concentration thereof is high, it is possible to sterilize a medical device inside a medical-device sterilization box. As a result, it is possible to provide a chlorine-dioxide-gas generation device which makes it possible to quickly and sustainably generate chlorine-dioxide gas and easily manage the concentration of the chlorine-dioxide gas.本發明係提供一種快速且持續地產生二氧化氯氣體、並且容易管控二氧化氯氣體濃度之二氧化氯氣體產生裝置。藉由表面積擴大元件(30)，將儲存於貯存槽(20)中經紫外線(71)照射之穩定性二氧化氯水(10)之表面積加以擴大，使其快速產生二氧化氯氣體，並藉由通風元件(61)排放至容器外、藉由對液狀的穩定性二氧化氯照射紫外線，能夠穩定地將二氧化氯氣體排放。藉由調整穩定性二氧化氯水(10)的濃度與紫外線(71)的輸出量，能夠調整二氧化氯氣體的發生濃度。藉由將對於人而言是安全的低濃度二氧化氯氣體直接排放至人生活的室內，能夠將該室內各個角落殺菌。在高濃度的情況下，可以用來對醫療器具用殺菌盒內的醫療器具實施殺菌。
