A door hinge comprising: a body frame mounted in use to a body of an apparatus having a door; a door frame mounted in use to the door and configured to be rotated by being connected to the body frame; an internal frame provided inside the door frame, the internal frame comprising a pin provided on a first side thereof to cross a front surface of a first side of the door frame, and the internal frame having a second side thereof connected to the body frame via a link shaft such that the internal frame is configured to be rectilinearly moved to a second side direction when the door frame is rotated; a rod frame provided inside the internal frame, the rod frame comprising a rod portion to which an elastic member is fitted, a body portion having a first side thereof connected to the rod portion and provided to prevent the elastic member from being separated, and a roller provided on a second side of the body portion and configured to be rotated in contact with the body frame when the door frame is rotated; a pin hole which is provided in the first side of the door frame and into which the pin is fitted, the pin hole being configured such that the pin is rectilinearly moved; and a link hole which is provided in a second side of the door frame and into which the link shaft is fitted, the link hole being formed in a curved line shape such that the link shaft is rotated, wherein when the door frame is rotated, the internal frame is rectilinearly moved by a rotation movement of the link shaft, and the elastic member is pressed by the pin of the internal frame, and a closing force is applied to the door frame by both an elasticity of the elastic member and a force that the roller contacts the body frame. a body frame mounted in use to a body of an apparatus having a door; a door frame mounted in use to the door and configured to be rotated by being connected to the body frame; an internal frame provided inside the door frame, the internal frame comprising a pin provided on a first side thereof to cross a front surface of a first side of the door frame, and the internal frame having a second side thereof connected to the body frame via a link shaft such that the internal frame is configured to be rectilinearly moved to a second side direction when the door frame is rotated; a rod frame provided inside the internal frame, the rod frame comprising a rod portion to which an elastic member is fitted, a body portion having a first side thereof connected to the rod portion and provided to prevent the elastic member from being separated, and a roller provided on a second side of the body portion and configured to be rotated in contact with the body frame when the door frame is rotated; a pin hole which is provided in the first side of the door frame and into which the pin is fitted, the pin hole being configured such that the pin is rectilinearly moved; and a link hole which is provided in a second side of the door frame and into which the link shaft is fitted, the link hole being formed in a curved line shape such that the link shaft is rotated, wherein when the door frame is rotated, the internal frame is rectilinearly moved by a rotation movement of the link shaft, and the elastic member is pressed by the pin of the internal frame, and a closing force is applied to the door frame by both an elasticity of the elastic member and a force that the roller contacts the body frame.