The present invention relates to synthetic studies on novel indole derivatives having a carbamoyl group, a ureido group and a substituted oxy group or a salt thereof, and pharmaceutical actions of the derivatives. The compound and a salt thereof represented by the general formula (1) has an IRK² inhibitory activity and is useful as a preventive and/or therapeutic agent for diseases considered to be associated with IKK². In the formula, R 1 represents a hydrogen atom, a lower alkyl group which may have a substituent, a hydroxy group, or a lower alkoxy group which may have a substituent, or the like； R 2 represents a hydrogen atom, a lower alkyl group which may have a substituent, a lower cycloalkyl group which may have a substituent, an aryl group which may have a substituent, or a heterocyclic group which may have a substituent, or the like； R 3 represents a halogen atom, a lower alkyl group which may have a substituent, a lower alkenyl group which may have a substituent, a lower alkynyl group which may have a substituent, a lower cycloalkyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, or the like； m represents 0, 1, 2, or the like.
