IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of predicting at what time point an accident will occur since a current time point. SOLUTION: The image forming apparatus successively performs: storing acquisition group data comprising a plurality of kinds of data acquired by various sensors 2 or the like to a hard disk at each time when prescribed timing arrives; storing data including inclination data of variation of values from a time point which goes up to a past rather than an acquisition time point only by a prescribed acquisition number-of-time part to the hard disk in addition to the plurality of the kinds of the data as normal group data used for multi-change amount analysis; and calculating abnormality determination index values based on a calculation result, newest acquisition group data and normal group data group after calculating the inclination data respectively of the plurality of the kinds of the data in the acquisition group data, based on the newest acquisition group data acquired by the various sensors 2 or the like and the past acquisition group data stored in the hard disk. COPYRIGHT: (C)2008,JPO&INPIT