A compound represented by the formula (1) [A represents a nitrogen-containing saturated ring m represents an integer of 0 to 2 n represents an integer of 1 to 4 G1 represents hydrogen atom, chlorine atom, hydroxyl group, an alkoxy group, or amino group G2 represents a halogen atom, hydroxyl group, cyano group, carboxy group, an alkyl group, an alkenyl group, and the like G3 represents hydrogen atom, a halogen atom, hydroxyl group, cyano group, carboxy group, an alkyl group, an alkenyl group, and the like G4 represents hydroxyl group, or —N(R1)(R2) (R1 and R2 represent hydrogen atom, an alkyl group, an aralkyl group, an alkenyl group, an alkynyl group, or a saturated heterocyclic group) G5 is a substituent on a ring-constituting carbon atom of A, and represents hydrogen atom, fluorine atom, or an alkyl group] or a salt thereof, or a derivative thereof that is a prodrug, which potently inhibits Rho kinase.
