The invention relates to a herbicide composition containing (A) an amino acid-based herbicide and (B) a compound having a branched structure represented by formula (1):R1CH2O—(R2O)nH (1)wherein R1 represents a C3 to C29 branched alkyl or branched alkenyl group, R2 represents a C2 to C4 alkylene group, and n is a mean number in the range of 1 to 30.