Disclosed herein is a door hinge device for absorbing the closing impact of a furniture door, which is adapted to minimize a work load and the number of work processes thereof according to assembly and disassembly thereof through the modification of a retaining structure thereof. The door hinge device includes a furniture hinge 10, a damper adapter 20 and a covering member 30. According to the present invention, since the assembly and disassembly of the door hinge device can be performed in a one-touch manner through the interaction between the damper adapter and the covering member, a convenience of the operation according to the assembly and disassembly of the door hinge device is improved, a work load is reduced, and a safety accident such as injury of hands and the like is prevented.