A boarding bridge comprising: a fixed tunnel of which one end is connectable to a terminal or an extended fixed tunnel; a rotunda of which one end is connected to the other end of the fixed tunnel; and a rotunda column configured to support the rotunda and having a raising and lower unit configured to raise or lower the rotunda; wherein the boarding bridge further comprises a movable tunnel configured to connect the rotunda to an airplane, wherein one end of the movable tunnel is connected to the other end of the rotunda, and the other side of the movable tunnel is configured to be raised or lowered; a driving unit, provided on the other side of the movable tunnel, configured to raise or lower the other side of the movable tunnel; and a first hinge unit having a first hinge and a first hinge fixing member, the first hinge being provided at any one of one end of the fixed tunnel and the terminal or at any one of the one end of the fixed tunnel and the extended fixed tunnel, the first hinge fixing member being provided at the other one of the one end of the fixed tunnel and the terminal or the other one of the one end of the fixed tunnel and the extended fixed tunnel, wherein the first hinge is a sliding hinge and the first hinge fixing member includes a first hinge guide part (1113a, 1113b) to enable the first hinge to be slid and moved; and a second hinge unit having a second hinge and a second hinge fixing member, the second hinge being provided at any one of the other end of the fixed tunnel and the one end of the rotunda, the second hinge fixing member being provided at the other one of the other end of fixed tunnel and the one end of the rotunda; wherein the raising and lowering unit includes a hydraulic device having a hydraulic power unit configured to generate a hydraulic power and a hydraulic hose configured to transfer the hydraulic power generated from the hydraulic power unit to operate the raising and lowering unit; and wherein the driving unit is connected to the hydraulic hose of the hydraulic device and configured to be driven by the hydraulic device to raise or lower the other side of the movable tunnel. a fixed tunnel of which one end is connectable to a terminal or an extended fixed tunnel; a rotunda of which one end is connected to the other end of the fixed tunnel; and a rotunda column configured to support the rotunda and having a raising and lower unit configured to raise or lower the rotunda; wherein the boarding bridge further comprises a movable tunnel configured to connect the rotunda to an airplane, wherein one end of the movable tunnel is connected to the other end of the rotunda, and the other side of the movable tunnel is configured to be raised or lowered; a driving unit, provided on the other side of the movable tunnel, configured to raise or lower the other side of the movable tunnel; and a first hinge unit having a first hinge and a first hinge fixing member, the first hinge being provided at any one of one end of the fixed tunnel and the terminal or at any one of the one end of the fixed tunnel and the extended fixed tunnel, the first hinge fixing member being provided at the other one of the one end of the fixed tunnel and the terminal or the other one of the one end of the fixed tunnel and the extended fixed tunnel, wherein the first hinge is a sliding hinge and the first hinge fixing member includes a first hinge guide part (1113a, 1113b) to enable the first hinge to be slid and moved; and a second hinge unit having a second hinge and a second hinge fixing member, the second hinge being provided at any one of the other end of the fixed tunnel and the one end of the rotunda, the second hinge fixing member being provided at the other one of the other end of fixed tunnel and the one end of the rotunda; wherein the raising and lowering unit includes a hydraulic device having a hydraulic power unit configured to generate a hydraulic power and a hydraulic hose configured to transfer the hydraulic power generated from the hydraulic power unit to operate the raising and lowering unit; and wherein the driving unit is connected to the hydraulic hose of the hydraulic device and configured to be driven by the hydraulic device to raise or lower the other side of the movable tunnel.