An image forming apparatus provided with a conductive member to form an image on a sheet using a toner includes: a voltage acquisition portion configured to acquire a biased voltage value as a voltage value by applying a bias to the conductive member; an environment sensor configured to output an environment condition measurement value representing an internal environment condition; and a hardware processor configured to transform the biased voltage value acquired by the voltage acquisition portion into a virtual voltage value appearing in the conductive member as the biased voltage value under a standard environment condition, in which the environment condition has a predetermined standard condition, on the basis of the environment condition measurement value output from the environment sensor, and determine a service life of the conductive member on the basis of the virtual voltage value.