An image scanning apparatus that is capable of executing control about an interrupt scan without using another apparatus. The image scanning apparatus includes a scanner and a controller. The scanner scans a document. The controller determines whether interrupt execution of a second scan that is different from a first scan is permitted based on a setting relevant to the first scan that is being executed. The scanner executes the second scan after suspending the first scan in a case where the interrupt execution of the second scan is permitted, and the scanner restarts the first scan after executing the second scan.