A decontamination-solution spray device includes: an atomizer including first and second ports and a nozzle； a first pipe having one end and an other end respectively connected to an air compressor and the first port； a second pipe, provided lower than the second port, having one end connected to the second port and an other end open； a reservoir portion to store a decontamination solution； a pump to pump up the solution from the reservoir portion； and a third pipe, having one end connected to the pump, thorough which the decontamination solution taken in by the pump flows, the atomizer to, suck the decontamination solution flowing through the third pipe via the second pipe, by negative pressure produced in the second port by injecting air taken in from the first port from the nozzle； and inject the solution in an atomized state from the nozzle, mixing the solution with air.
