To provide a herbicidal composition having an excellent weed control effect.

The herbicidal composition is characterized by containing a pyridazinone compound expressed by formula (I) (in the formula, R1 is a 1-6C alkyl group or a (1-6C alkyloxy)1-6C alkyl group; R2 is a hydrogen atom or a 1-6C alkyl group; G is a hydrogen atom etc.; Z1 is a 1-6C alkyl group; Z2 is a 1-6C alkyl group; n is 0, 1, 2, 3 or 4, and when n is an integer of at least 2, each of Z2 is the same or different, where the total number of carbon atoms in the group expressed by Z1 and n number of Z2 is at least 2), flumioxazin and a specific herbicide.