An image forming apparatus includes a photosensitive member, a developing device for developing with toner an electrostatic image formed on the photosensitive member, a temperature/humidity sensor, and a storing portion for storing environmental information. In addition, a controller controls an image forming condition so that when a second temperature/humidity environment, measured by the temperature/humidity sensor, is different from a first temperature/humidity environment and when the image forming condition is changed to a second image forming condition different from a first image forming condition, a change amount of the image forming condition when the developing device is driven before the image forming condition is changed is larger than a change amount of the image forming condition when the developing device is not driven before the image forming condition is changed. The controller controls the image forming condition on the basis of environmental information and time information relating to the environmental information which is previously stored in the storing portion and on the basis of environmental information and time information relating to the environmental information which is obtained after being stored in the storing portion.