Walk assist apparatus

PURPOSE: The walking-assistance apparatus is provided to improve a power transmission efficiency by reducing a power transmission distance between a driving part and a joint part, to allow a user to wear the apparatus easily, and to facilitate movement. CONSTITUTION: Upright-walking assistance apparatus (1) comprises a supporting unit that comprises a first supporting part (110) that supports a back of a user, a second supporting part (120) of which one end is connected to the first supporting part and that supports thighs of the user, a third supporting part (130) that is connected to the other end of the second supporting part and supports lower legs of the user, a hip joint part (140) that rotably combines the second supporting part to the first supporting part, and a knee joint part (150) that rotably combines the third supporting part to the second supporting part; a driving motor installed on the first supporting part; a link driving part 220 that is installed on the driving motor and the hip joint part as to rotate the second supporting part by transmitting a rotation force of the driving motor to the second supporting part; a driving unit including a motion transmission part of which one side is interlockingly installed to the link driving part and the other side is installed on the knee joint part such that a rotation force of the driving motor is transmitted to the third supporting part to rotate the third supporting part; a battery supplying power to the driving motor; and a control unit (400) that controls operation of the driving motor.