Aircraft passenger boarding bridge having a stepless passage

An aircraft passenger boarding bridge, comprising:

• a first tunnel including a hollow portion and a first fixed passage on which a passenger walks, in the hollow portion;
• and
• a second tunnel into which the first tunnel is inserted from one end side of the second tunnel, the second tunnel including a hollow portion and a second fixed passage on which a passenger walks, wherein the second tunnel having another end side connected to a cab, the second fixed passage being fixed to the another end side,
• wherein the second tunnel comprises a movable passage including multiple floor members chained with each other, each of the multiple floor members being pivotably connected with each other at an edge side, one end of the movable passage being pivotably connected to the second fixed passage of the second tunnel,
• wherein a passage surface height of the movable passage is the same as a passage surface height of the first fixed passage of the first tunnel,
• wherein the first tunnel comprises at least one guide rail extending along a direction of movement,
• wherein the multiple floor members has a support rod extending from another edge side of each of the multiple floor members, and
• wherein movement of the support rod along the one guide rail causes downward movement of the movable passage below the first fixed passage of the first tunnel when the aircraft passenger boarding bridge is contracted, or upward movement of the movable passage from below the first fixed passage of the first tunnel when the aircraft passenger boarding bridge is extended.