[PROBLEMS] To provide a compound which can be used for the prevention and/or treatment of a disease associated with a 5-HT2B receptor or a 5-HT7 receptor, particularly for the treatment of irritable bowel syndrome (IBS). [MEANS FOR SOLVING PROBLEMS] It is found that a pyrrole derivative having a guanidinocarbonyl group or an amide group at position-3 as a substituent or a pharmaceutically acceptable salt thereof has a potent antagonistic effect on both of a 5-HT2B receptor and a 5-HT7 receptor. The compound shows a better pharmacological activity compared to an antagonist which is selective to either of these receptors. Therefore, the compound is useful for the prevention and/or treatment of a disease associated with a 5-HT2B receptor or a 5-HT7 receptor, particularly for the treatment of irritable bowel syndrome (IBS).