An image forming apparatus comprising: a body; a cover which is configured to open/close one side of the body; a tray which is slidably installed in the body so as to be movable in a first direction through the one side of the body which can be opened by the cover; at least one developing cartridge (40C, 40M, 40Y, 40K) which is installed inside the body while being accommodated at the tray and which is provided at one side with an interface terminal to be supplied with a power used to form an image; a connection terminal plate which is coupled to the body and to the cover by a link mechanism, such that the connection terminal plate is configured to slidably move in a second direction different from the first direction in linkage with the opening/closing motion of the cover; a connection terminal which is coupled to the connection terminal plate such that the connection terminal makes contact with the interface terminal while being pressed by the connection terminal plate when the cover closes the body, and the connection terminal is separated from the interface terminal while being released from a pressing force of the connection terminal plate when the cover opens the body; and. a guide rail which is movably coupled to one side of the body and is configured to move in linkage with the cover while connected to the cover, wherein the connection terminal plate is configured to press the connection terminal or to release a pressing force on the connection terminal while moving in linkage with the guide rail; wherein the link mechanism comprises: a first link mechanism configured to connect the connection terminal plate to the guide rail; a second link mechanism configured to slidably couple the body to the guide rail; and a third link mechanism configured to slidably couple the connection terminal plate to the body. a body; a cover which is configured to open/close one side of the body; a tray which is slidably installed in the body so as to be movable in a first direction through the one side of the body which can be opened by the cover; at least one developing cartridge (40C, 40M, 40Y, 40K) which is installed inside the body while being accommodated at the tray and which is provided at one side with an interface terminal to be supplied with a power used to form an image; a connection terminal plate which is coupled to the body and to the cover by a link mechanism, such that the connection terminal plate is configured to slidably move in a second direction different from the first direction in linkage with the opening/closing motion of the cover; a connection terminal which is coupled to the connection terminal plate such that the connection terminal makes contact with the interface terminal while being pressed by the connection terminal plate when the cover closes the body, and the connection terminal is separated from the interface terminal while being released from a pressing force of the connection terminal plate when the cover opens the body; and. a guide rail which is movably coupled to one side of the body and is configured to move in linkage with the cover while connected to the cover, wherein the connection terminal plate is configured to press the connection terminal or to release a pressing force on the connection terminal while moving in linkage with the guide rail; wherein the link mechanism comprises: a first link mechanism configured to connect the connection terminal plate to the guide rail; a second link mechanism configured to slidably couple the body to the guide rail; and a third link mechanism configured to slidably couple the connection terminal plate to the body. a first link mechanism configured to connect the connection terminal plate to the guide rail; a second link mechanism configured to slidably couple the body to the guide rail; and a third link mechanism configured to slidably couple the connection terminal plate to the body.