To make effective use of a hybrid RFID tag.

An image forming device includes: acquisition and holding means, provided on a detachable supply article, for acquiring and holding environmental information on surroundings of the supply article; reading means for reading the acquired and held environmental information; a table for presetting an amount of an idling process to be executed before re-starting image formation on the basis of the environmental information and lapsed time since end of latest image formation; reference means for referring to the amount of the idling process corresponding to the environmental information read by the reading means and the lapsed time on the basis of the table; and execution means for executing the idling process referred to by the reference means.