The invention is a volatilization liquid that causes a volatilization member to absorb and volatilize, the volatilization agent is stably solubilized, and it is possible to suppress a decrease in the volatilization rate of the volatilization agent in the middle and later stages of use. It aims at providing the volatilization liquid excellent in sustainability. In the volatilization liquid containing a volatilizing agent, a surfactant, and water, the volatilization member is made to absorb and volatilize, and at least an anionic surfactant is used as the surfactant, and the surface activity contained in the volatilization liquid By setting the ratio of the anionic surfactant per 100 parts by weight of the total amount of the agent to 40 parts by weight or more, the volatilizing agent can be solubilized, and the lowering of the volatilization rate in the middle and later stages can be suppressed, and the volatility can be achieved. The persistence of the effect of the drug is improved.発明は、揮散部材に吸液させて揮散させる揮散液であって、揮散性薬剤が安定に可溶化されており、しかも使用中期及び後期における揮散性薬剤の揮散速度の低下を抑制でき、効果の持続性に優れる揮散液を提供することを目的とする。 揮散性薬剤、界面活性剤、及び水を含有する、揮散部材に吸液させて揮散させる揮散液において、界面活性剤として、少なくともアニオン性界面活性剤を使用し、且つ揮散液に含まれる界面活性剤の総量１００重量部当たりのアニオン性界面活性剤の比率を４０重量部以上に設定することにより、揮散性薬剤を可溶化でき、しかも使用中期及び後期の揮散速度の低下を抑制し、揮散性薬剤の効果の持続性が良好になる。
