Abstract: The present invention relates to a boarding bridge with a minute approaching device and a shock absorbing part and an operation method thereof. The boarding bridge comprises a rotunda; a tunnel which contractably extends from the rotunda and forms a passage; a cab which is rotatbly coupled to the tunnel and connects the tunnel and aircraft; a main moving device which moves the cab by contraction and extension of the tunnel from a standby location of the cab and an adjacent location of the aircraft; and a minute approaching device which is provided in an end part of the cab and minutely moves the end part of the cab from the adjacent location to a contact location of the aircraft while the contraction and extension of the tunnel stops.