The present invention provides a door hinge, which comprises: a fixing member fixedly installed to a door frame; and an operating member coupled to a connecting member through a hinge shaft to pivot around the hinge shaft and to open and close a door, the connecting member being installed to the door and fixedly installed to the fixing member, and further comprises: a bumper attached to a rear surface of the operating member; a shaft installed to the fixing member to be movable forward or backward, wherein the shaft moves horizontally when a front end thereof comes into contact with and is pushed backward by the bumper of the operating member, in response to a closing movement of the door, from a state in which the front end is exposed to the front side of the fixing member; a slide whichis fixedly installed to an upper surface of the shaft and moves horizontally backward in response to a movement of the shaft; an inclined surface portion formed on an upper surface of the slide; an elevating board having an inclined bottom portion in surface contact with the inclined surface portion of the slide, the elevating board vertically moving up and down along the inclined surface portionin response to a horizontal movement of the slide; and a damper located at the upper end of the elevating board, wherein the damper attenuates a closing speed of the door when the damper is pushed upward and generates resistance force, in response to an up and down movement of the elevating board, from a state in which the damper is in contact with the upper end of the elevating board.