PURPOSE: To accurately manage the life of an array line head.

CONSTITUTION: An electrophotographic device using the array line head 20 is provided with a means 40 for counting the number of light emitting times, a means 45 for counting the number of non-light emitting times, means 31 and 32 for calculating driving times, a means 35 for setting the reference number of driving times, signal generation means 31 and 32 for controlling a life, and a notifying means 34; the number Na of substantial-driving times Na is obtained by using weight coefficient K while directly counting the number Nd of actual light-emitting times and the number Nr of non-light emitting times of the electronic light-emitting element 21 of the array line head 20, and when the Na exceeds the reference number Nas of driving times previously set, it is notified.