This chemical agent-spraying device is provided with a chemical agent tank (12) and chemical agent-jetting parts (13) that jet out a chemical agent supplied from the chemical agent tank (12). The chemical agent-jetting parts (13) include a first chemical agent-jetting part (16) that jets out the chemical agent onto the reverse surfaces of crop leaves as an area to which the chemical agent is to be jetted, and a second chemical agent-jetting part (17) that jets out the chemical agent onto the obverse surfaces of crop leaves as an area to which the chemical agent is to be jetted.