A motion assistance apparatus comprising: a driving source configured to generate power; a first supporting member configured to support a first portion of a user; a second supporting member configured to support a second portion of the user; a power transmitting frame connected to the second supporting member, wherein the power transmitting frame is arranged rotatably relative to the first supporting member ; a power transmitting device , arranged to transmit the power generated by the driving source to the power transmitting frame , wherein the power transmitting device comprises: an input side gear assembly including a first power input terminal and a plurality of first power output terminals; characterized in that the power transmitting device further comprises: an output side gear assembly including a plurality of second power input terminals and a second power output terminal, wherein the plurality of second power input terminals is connected to the plurality of first power output terminals of the input side gear assembly to receive power therefrom, respectively; and a stopper mechanism configured to select, for power transmission, one of a plurality of power transmitting paths connecting the plurality of first power output terminals and the plurality of second power input terminals; wherein the first power input terminal is connected to the driving source to receive the power therefrom and the second power output terminal is connected to the power transmitting frame to transmit the power thereto. a driving source configured to generate power; a first supporting member configured to support a first portion of a user; a second supporting member configured to support a second portion of the user; a power transmitting frame connected to the second supporting member, wherein the power transmitting frame is arranged rotatably relative to the first supporting member ; a power transmitting device , arranged to transmit the power generated by the driving source to the power transmitting frame , wherein the power transmitting device comprises: an input side gear assembly including a first power input terminal and a plurality of first power output terminals; characterized in that the power transmitting device further comprises: an output side gear assembly including a plurality of second power input terminals and a second power output terminal, wherein the plurality of second power input terminals is connected to the plurality of first power output terminals of the input side gear assembly to receive power therefrom, respectively; and a stopper mechanism configured to select, for power transmission, one of a plurality of power transmitting paths connecting the plurality of first power output terminals and the plurality of second power input terminals; an output side gear assembly including a plurality of second power input terminals and a second power output terminal, wherein the plurality of second power input terminals is connected to the plurality of first power output terminals of the input side gear assembly to receive power therefrom, respectively; and a stopper mechanism configured to select, for power transmission, one of a plurality of power transmitting paths connecting the plurality of first power output terminals and the plurality of second power input terminals; wherein the first power input terminal is connected to the driving source to receive the power therefrom and the second power output terminal is connected to the power transmitting frame to transmit the power thereto. <EOS>