To provide a technology for confirming nozzle clog while reducing an amount of use of ink.

In an inkjet type recording apparatus 1, from among a plurality of nozzles arranged in a writing head 6 and ejecting ink droplets, nozzles used for ink droplet ejection according to image data upon image formation, are stored as use nozzles, into a use nozzle recording table of a RAM 13. At timing other than image formation, ink droplet is idly ejected only from a nozzle other than use nozzles recorded in the use nozzle recording table. Thus, nozzle clog is confirmed.