An image forming apparatus is provided. The image forming apparatus includes: plural photosensitive members aligned in a first direction; plural developing units for the photosensitive members, respectively, each of the developing units including a developer supplier, and a housing which holds the developer supplier; a translation member which moves the developing units between a contact position in which the developer suppliers contact the photosensitive members and a separated position in which the developer suppliers are separated from the photosensitive members by a linear reciprocating movement in the first direction; plural memory chips provided on the housings of the developing units, respectively; plural contacts provided on the translation member, each of the contacts configured to contact the corresponding memory chips; and a wiring provided on the translation member and electrically connected to each of the contacts.