Disclosed is a 1,2,4-triazinedione compound of formula (1) where the substituents are as disclosed in the specification and A represents a 5- or 6-membered cyclic group which may contain a nitrogen atom, an oxygen atom, or a sulfur atom. Also disclosed is a herbicidal composition comprising a compound of formula (1) and a method for eliminating weeds in soils by applying a compound of formula (1). Disclosed are compounds exhibiting sufficient herbicidal activity at low application dosage when they are applied to soils and foliage, and an agrochemical composition using the same, in particular herbicides. The compounds are triazine derivatives represented by following Formula 1 or salts thereof, and the herbicides containing them.
