An article transport device configured to transport an article toward a downstream processing device, the article transport device comprising: an input section configured to input an article; an import mechanism (22, 22a) configured to import, toward the processing device, the article input from the input section; a passage detection sensor configured to detect that the article imported by the import mechanism (22, 22a) has passed by a predetermined position; an article stopper configured to block the article in a traveling direction and to suspend movement of the article; a suspending pusher configured to temporarily suspend a subsequent article at a time when a preceding article is processed by the processing device; an article detection sensor disposed upstream of the passage detection sensor, a controller the article transport device being characterized in that it comprises an article passage timer configured to start counting up at a time when the passage detection sensor detects that a front end of the article passes by the passage detection sensor, and the controller being configured to calculate an expected passage time for a single article to pass by the passage detection sensor, based on a predetermined length of the single article in a transport direction and on a transport speed of an import belt of the import mechanism, the controller further being configured to determine that subsequent articles successively move and to cause the pusher rod portion of the suspending pusher to operate and separate the subsequent articles from a preceding article in a case where the article detection sensor still detects a subsequent article after a counted time of the article passage timer that exceeds the expected passage time while the preceding article is passing by the passage detection sensor. an input section configured to input an article; an import mechanism (22, 22a) configured to import, toward the processing device, the article input from the input section; a passage detection sensor configured to detect that the article imported by the import mechanism (22, 22a) has passed by a predetermined position; an article stopper configured to block the article in a traveling direction and to suspend movement of the article; a suspending pusher configured to temporarily suspend a subsequent article at a time when a preceding article is processed by the processing device; an article detection sensor disposed upstream of the passage detection sensor, a controller the article transport device being characterized in that it comprises an article passage timer configured to start counting up at a time when the passage detection sensor detects that a front end of the article passes by the passage detection sensor, and the controller being configured to calculate an expected passage time for a single article to pass by the passage detection sensor, based on a predetermined length of the single article in a transport direction and on a transport speed of an import belt of the import mechanism, the controller further being configured to determine that subsequent articles successively move and to cause the pusher rod portion of the suspending pusher to operate and separate the subsequent articles from a preceding article in a case where the article detection sensor still detects a subsequent article after a counted time of the article passage timer that exceeds the expected passage time while the preceding article is passing by the passage detection sensor.