Abstract: A line head device comprises a line head that has plural blocks of EL elements arranged in a row in the direction of a printing line for paper supplied to a transfer position and printed in line units. In the line head device, the line head has more than n blocks of EL elements, where n is the maximum number of EL elements required for the printing, and switches and a control circuit are provided to enable a group of n successive EL elements to be driven and change the group in accordance with paper alignment error in the processing line direction.