According to one embodiment, a docking unit includes a placement surface which slopes down to a front side of the docking unit and configured to receive an electronic device, a docking connector on the placement surface and configured to connect to an extended connector of the electronic device, a groove portion recessed under the placement surface and located behind the docking connector, a biasing member detachably fitted into the groove portion, and a pressing member on a top surface of the biasing member configured to protrude upward from the top surface and to retract downward into the top surface by first resilience.