A nozzle-clogging determining device configured to detect passing of a plurality of droplets ejected from nozzles of a head of an inkjet printer, thereby performing determination on clogging of the nozzles, the nozzle-clogging determining device comprising: a droplet detector, including: a light emitter, configured to emit detection light for detecting passing of the droplets in a direction intersecting with a traveling direction of the droplets; and a light receiver, configured to receive the detection light, wherein the light emitter, a passage of the droplets and the light receiver are disposed along a light path of the detection light; and a determination controller, configured to cause ejection a plurality of droplets from the nozzles of the head, and perform determination on nozzle clogging on the basis of a light interception rate of the detection light received by the light receiver when the droplets are positioned inside a spot of the detection light received by the light receiver, wherein the determination controller is configured to: sequentially cause ejection of a plurality of consecutive droplets at equal intervals of time from individual nozzles of the head; perform determination on nozzle clogging at intervals of a time which is predetermined, on the basis of detection results of the droplet detector; consecutively record the nozzle clogging determination results; record determination results regarding droplets ejected from the head before and/or after sequentially causing consecutive ejection of the droplets from the individual nozzles, as references for dividing the nozzle clogging determination results into equal intervals of time for the individual nozzles, such that the determination results that serve as the references and the nozzle clogging determination results are arranged in chronological order; divide the nozzle clogging determination results into equal intervals of time for the individual nozzles on the basis of the determination results that serve as the references; and determine whether ejection states of the individual nozzles are normal or not. a droplet detector, including: a light emitter, configured to emit detection light for detecting passing of the droplets in a direction intersecting with a traveling direction of the droplets; and a light receiver, configured to receive the detection light, wherein the light emitter, a passage of the droplets and the light receiver are disposed along a light path of the detection light; and a light emitter, configured to emit detection light for detecting passing of the droplets in a direction intersecting with a traveling direction of the droplets; and a light receiver, configured to receive the detection light, wherein the light emitter, a passage of the droplets and the light receiver are disposed along a light path of the detection light; and a determination controller, configured to cause ejection a plurality of droplets from the nozzles of the head, and perform determination on nozzle clogging on the basis of a light interception rate of the detection light received by the light receiver when the droplets are positioned inside a spot of the detection light received by the light receiver, wherein the determination controller is configured to: sequentially cause ejection of a plurality of consecutive droplets at equal intervals of time from individual nozzles of the head; perform determination on nozzle clogging at intervals of a time which is predetermined, on the basis of detection results of the droplet detector; consecutively record the nozzle clogging determination results; record determination results regarding droplets ejected from the head before and/or after sequentially causing consecutive ejection of the droplets from the individual nozzles, as references for dividing the nozzle clogging determination results into equal intervals of time for the individual nozzles, such that the determination results that serve as the references and the nozzle clogging determination results are arranged in chronological order; divide the nozzle clogging determination results into equal intervals of time for the individual nozzles on the basis of the determination results that serve as the references; and determine whether ejection states of the individual nozzles are normal or not. sequentially cause ejection of a plurality of consecutive droplets at equal intervals of time from individual nozzles of the head; perform determination on nozzle clogging at intervals of a time which is predetermined, on the basis of detection results of the droplet detector; consecutively record the nozzle clogging determination results; record determination results regarding droplets ejected from the head before and/or after sequentially causing consecutive ejection of the droplets from the individual nozzles, as references for dividing the nozzle clogging determination results into equal intervals of time for the individual nozzles, such that the determination results that serve as the references and the nozzle clogging determination results are arranged in chronological order; divide the nozzle clogging determination results into equal intervals of time for the individual nozzles on the basis of the determination results that serve as the references; and determine whether ejection states of the individual nozzles are normal or not.