An inkjet recording apparatus includes a plurality of nozzles, storage, a first reading section, a first computing section, a selection section, and a controller. The storage stores first information and first pattern image data representing a first pattern image. The first reading section scans a sheet to generate sheet data. The first computing section computes positions of both edge portions of the sheet in a main scanning direction based on the sheet data. The selection section selects a plurality of used nozzles. The controller directs the used nozzles to form a second pattern image on the sheet.