An image formation apparatus is provided and includes: a photoconductor; a charging section that applies a bias voltage having an AC voltage superposed on a DC voltage to the photoconductor so as to charge the photoconductor; a controller that controls at least one of the AC voltage and an AC current in response to a fluctuation amount of a DC current flowing between the photoconductor and the charging section when an AC voltage is applied; and a detector that detects the DC current.