An ion generation device includes an ion generator that generates ions, an ion detector that detects generated ions, a blower that blows the generated ions to outside through a draft air duct, and a control unit that performs drive control of the ion generator and the blower. When the control unit detects absence of generation of ions at a time of starting operation or the like, the control unit stops driving of the ion generator for a short time while keeping the blower driving, and purges staying ions, after which, the control unit carries out ion detection by the ion detector, and determines presence or absence of ion generation. When the control unit determines that ion generation is absent, the control unit continuously performs determination of ion generation a plurality of times, and if ion generation is absent in all the determinations, finally determines generation of ions as absent.