A hub-embedded transmission device according to the present invention comprises: a hub coupled to a wheel as an output member； an axle shaft installed not to be rotated relative to a chassis to support the wheel； a transmission cam installed in the axle shaft to be rotated； a central shaft receiving the transmission cam and installed in the axle shaft； a planetary gear train having a carrier coupled to an input member to receive power applied to the input part and to support one or more pinion gears to be rotated, a sun gear coupled to the central shaft to be rotated, and a ring gear coupled to the hub to output the power inputted from the carrier to the hub； a lockup clutch installed in the central shaft to perform a translational motion in an axial direction, and directly connecting the carrier and the ring gear according to positions guided by the transmission cam； a transmission clutch installed in the central shaft to perform the translation motion in the axial direction, but determining whether or not the sun gear rotates according to the positions guided by the transmission cam； and an anti-reversing clutch installed in the central shaft and determining whether or not to prevent backward movement according to the position of the transmission cam. The present invention can control whether or not to prevent the backward movement while shifting the forward and backward driving force of a hand rim over two levels by controlling the operation of the lockup clutch, the transmission clutch, and the anti-reversing clutch according to the rotation directional position of the transmission cam.본 발명에 따른 허브 내장형 변속장치는, 출력부재인 바퀴에 결합되는 허브；차체에 대해 회전하지 않게 설치되어 바퀴를 지지하는 액슬샤프트； 상기 액슬샤프트에 회동가능하도록 축설되는 변속캠； 상기 변속캠을 수용하고, 상기 액슬샤프트에 축설되는 중심축； 입력부재에 결합되어 입력부재에 가해지는 동력을 전달받고, 적어도 하나 이상의 피니언 기어를 회동가능하도록 지지하는 캐리어와, 상기 중심축에 회동가능하도록 결합되는 태양기어와, 상기 허브에 결합되어 상기 캐리어로부터 입력된 동력을 상기 허브로 출력하는 링기어로 구성되는 유성기어열； 상기 중심축에 축설되어 축방향을 따라 병진운동하되, 상기 변속캠에 의해 안내된 위치에 따라 상기 캐리어와 상기 링기어를 직결시키는 직결클러치； 상기 중심축에
