An image forming apparatus comprising: a main body; a developing unit to form a visible image by feeding developer onto a photoconductor; a transfer unit placed in the main body to transfer the visible image formed on the photoconductor to a printing medium; a drawer configured to be slidably pushed into or pulled out of the main body and including a tray to support the developing unit and a front cover defining one surface of the main body and coupled to the tray so as to be moved along with the tray after passing through an operating section in which the front cover is moved relative to the tray; a coupling connector including a coupling rack coupled to the front cover so as to be able to move along with the front cover and so as to control connection of a coupling so as to transmit power to at least one inner roller of the developing unit; a Customer Replaceable Unit Module (CRUM) connector coupled to the coupling rack so as to control connection of a terminal so as to transmit developing information to the developing unit; a drive plate coupled to the front cover so as to be able to move along with the front cover and so as to move the developing unit between a first position where the photoconductor comes into contact with the transfer unit and a second position where the photoconductor is spaced apart from the transfer unit; and a high-voltage connector coupled to the tray so as to control connection of a terminal so as to apply high-voltage current to the developing unit 40, wherein the coupling connector, the CRUM connector and the high-voltage connector are configured to disconnect respectively, and the developing unit is moved to the second position by the drive plate, when the drawer is slidably pulled out of the main body, and wherein the coupling connector, the CRUM connector and the high-voltage connector are configured to connect respectively, and the developing unit is moved to the first position by the drive plate, when the drawer is slidably pushed into the main body. a main body; a developing unit to form a visible image by feeding developer onto a photoconductor; a transfer unit placed in the main body to transfer the visible image formed on the photoconductor to a printing medium; a drawer configured to be slidably pushed into or pulled out of the main body and including a tray to support the developing unit and a front cover defining one surface of the main body and coupled to the tray so as to be moved along with the tray after passing through an operating section in which the front cover is moved relative to the tray; a coupling connector including a coupling rack coupled to the front cover so as to be able to move along with the front cover and so as to control connection of a coupling so as to transmit power to at least one inner roller of the developing unit; a Customer Replaceable Unit Module (CRUM) connector coupled to the coupling rack so as to control connection of a terminal so as to transmit developing information to the developing unit; a drive plate coupled to the front cover so as to be able to move along with the front cover and so as to move the developing unit between a first position where the photoconductor comes into contact with the transfer unit and a second position where the photoconductor is spaced apart from the transfer unit; and a high-voltage connector coupled to the tray so as to control connection of a terminal so as to apply high-voltage current to the developing unit 40, wherein the coupling connector, the CRUM connector and the high-voltage connector are configured to disconnect respectively, and the developing unit is moved to the second position by the drive plate, when the drawer is slidably pulled out of the main body, and wherein the coupling connector, the CRUM connector and the high-voltage connector are configured to connect respectively, and the developing unit is moved to the first position by the drive plate, when the drawer is slidably pushed into the main body.