An integrated locking device is described. The integrated locking device is utilized to lock and remove a removable device and is especially suitable in a notebook computer. The locking device has a latch, a first elastic device, a push arm, and a sliding switch. The latch locks a fixing indention of the removable device to fix the removable device. The first elastic device provides a force to push the latch moving forward and a space for the latch moving back. When the removable device is taken out, the sliding switch pushes the push arm first. Then, a slider of the push arm pushes a sliding inclined surface of the latch to withdraw the latch from the fixing indention. Subsequently, the push arm pushes the removable device outward for releasing the removable device. The movements of the sliding switch and the latch form an included angle, preferably about 90 degrees.