In a printing device employing a solenoid (116) for driving a printing hammer (110), provided are switching member (126) for ON/OFF operating electric current flowing through the solenoid coil (116), voltage generating member (128) for generating voltage in accordance with the electric current, converting member (130) for converting the generated voltage to a digital value, chopping member (134) for comparing the converted digital value with a predetermined comparison value, while for turning on the switching member (126) when the converted value is smaller than the predetermined comparison value and turning off the switching member (126) when the converted value is larger than the predetermined comparison value, another chopping member for alternatively turning the switching member in another predetermined interval shorter than the predetermined interval, when the set value becomes similar to the comparison value, during said predetermined interval. Thus, the current deviation at each of the solenoid driving period are controlled to be limited in the desired range.