Provided are: an herbicidal agrochemical composition that has HPPD-inhibiting action; and an herbicidal method that uses the herbicidal agrochemical composition. An herbicidal agrochemical composition that contains: a herbicidal active component that has 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting action; and an inorganic phosphorus compound that comprises a phosphorus oxoacid or an agriculturally acceptable salt thereof.