Provided are a novel medicament for suppressing or preventing the metastasis of a malignant tumor such as carcinoma, a novel treatment or prevention method for suppressing or preventing the metastasis of a malignant tumor, etc. The medicament comprises a non-peptidic angiotensin type 2 receptor agonist as an active ingredient. In the medicament, the non-peptidic angiotensin type 2 receptor agonist may be, for example, a sulfonyl malonamide compound. The medicament may be a medicament for use in combination with an anticancer agent and/or an antitumor agent.
