A herbicidal composition having an excellent weed control effect, which comprises a pyridazinone compound represented by the formula (I): wherein R1 represents a C1-6 alkyl group or a (C1-6 alkyloxy) C1-6 alkyl group, R2 represents a hydrogen atom or a C1-6 alkyl group； G represents a hydrogen atom, etc., Z1 represents a C1-6 alkyl group, Z2 represents a C1-6 alkyl group, n represents 0, 1, 2, 3 or 4, and when n represents an integer of two or more, each Z2 may be the same or different, provided that the total number of carbon atoms in the groups represented by Z1 and n×Z2 is two or more； flumioxazin； and a specific herbicide.
