The present invention relates to: any one compound selected from the group consisting of pyridine-based compounds including an isoxazoline ring represented by Formula 1 and agriculturally acceptable salts thereof; a herbicide including the compound of Formula 1, an agriculturally acceptable salt thereof, or a mixture thereof as an active component; and a method for preparing a pyridine-based compound including an isoxazoline ring represented by Formula 1 from a reaction involving compounds represented by Formula 2 and Formula 3.