To provide an apparatus for spraying a chemical, which can make moderate its spray volume of a chemical while preventing the increase of the number of components, and can spray the chemical uniformly in conjunction with the flight speed of an unmanned helicopter while expanding the range of the flight speed.

The apparatus 5 for spraying the chemical is mounted on the unmanned helicopter 1 and aerially sprays the chemical. The apparatus includes: tanks 51L and 51R in which the chemical is stored; pumps 52L and 52R for feeding by pressure the chemical in both of the tanks 51L and 51R; and mist nozzles 55C, 55L and 55R for spraying the chemical fed by pressure with the pumps 52L and 52R in mist.