An extracting method includes: an extracting step of extracting a specific component from a material fluid to an extraction agent while allowing the material fluid and the extraction agent to flow in a channel of the extraction unit for each stage; an outflowing step of outflowing a mixture fluid from the channel of the extraction unit for each stage before the extraction of the specific component reaches an extraction equilibrium; and a pH regulating step of regulating the pH of the material fluid separated in a separating step after flowing out of the channel of the extraction unit for a predetermined stage so as to cause a reverse change from a change caused in the pH of the material fluid in the extracting step, before the material fluid is introduced into the channel of the extraction unit for a stage succeeding to the predetermined stage.