The present invention provides a technique enabling long-term preservation of a chlorous acid aqueous solution and novel application thereof. A sterilizing agent comprising an aqueous solution comprising chlorous acid (chlorous acid aqueous solution), which is used as a sterilizing agent, comprises a chlorous acid aqueous solution, metal hydroxide, and metal phosphate. Preferably, an agent in which potassium is the metal and/or pH is 3.5 or higher and less than 7.0 is prepared, whereby an unexpected long-term stabilizing effect was demonstrated. Further, the present invention provides: a sterilizing agent for preventing secondary contamination, comprising a chlorous acid aqueous solution, or an article impregnated with a chlorous acid aqueous solution for preventing secondary contamination； an article impregnated with a chlorous acid aqueous solution for sterilizing a floor surface； an agent for removing odor comprising a chlorous acid aqueous solution or an article impregnated with a chlorous acid aqueous solution for removing odor； and an agent for removing microbes adhering to the body, comprising a chlorous acid aqueous solution or an article impregnated with a chlorous acid aqueous solution for removing body adhering microbes.La présente invention concerne une technique permettant la conservation à long terme d'une solution aqueuse d'acide chloreux ainsi qu'une application nouvelle de ladite solution. Un agent stérilisant comprenant une solution aqueuse comprenant de l'acide chloreux (solution aqueuse d'acide chloreux), laquelle est utilisée comme un agent stérilisant, comprend une solution aqueuse d'acide chloreux, un hydroxyde de métal et un phosphate de métal. De manière préférentielle, un agent dans lequel le potassium est le métal et/ou le pH est compris entre 3.5 et 7.0 est préparé, grâce à quoi un effet inattendu de stabilisation à long terme a été démontré. L'invention concerne également: un agent stérilisant permettant d'empêcher la contamination secon
