An image forming apparatus according to the present invention includes a replaceable unit in which a plurality of replaceable parts are installed, a storage section to store a replacement time count value, a life duration time count value and a use count value, a display section and a control section to update the use count value in the storage section by counting the number of times of use of each of the parts installed in the unit, to determine whether a part which reached the life duration time exists or not based on the use count value of each of the parts which are update and the life duration time count value, and to display information for urging a replacement of the part which reached the life duration time and a part in which the use count value reached between the replacement time count value and the life duration time count value in the display section when the control section determines that the part which reached the life duration time exists.