A wearable action-assist device configured to assist or to execute an action of a wearer by substituting for the wearer, comprising: an action-assist tool including an actuator configured to give power to the wearer; a biosignal sensor for detecting a wearer's biosignal, the biosignal including a nerve transfer signal and a myoelectricity signal; a biosignal processing unit configured to acquire, from the biosignal detected by the biosignal sensor, the nerve transfer signal for operating a wearer's muscular line skeletal system, and the myoelectricity signal accompanied with a wearer's muscular line activity; characterized in that the device further comprises: a control unit (4, 14, 24) configured to generate a command signal for causing the actuator to generate power according to a wearer's intention by using the nerve transfer signal and the myoelectricity signal which are acquired by the biosignal processing unit; and a driving current generating unit configured to generate a current according to the nerve transfer signal and a current according to the myoelectricity signal, respectively, based on the command signal generated by the control unit, to supply the respective currents to the actuator, wherein the biosignal processing unit comprises: a unit configured to amplify the biosignal; a first filter configured to extract the nerve transfer signal from the biosignal; and a second filter configured to extract the myoelectricity signal from the biosignal. an action-assist tool including an actuator configured to give power to the wearer; a biosignal sensor for detecting a wearer's biosignal, the biosignal including a nerve transfer signal and a myoelectricity signal; a biosignal processing unit configured to acquire, from the biosignal detected by the biosignal sensor, the nerve transfer signal for operating a wearer's muscular line skeletal system, and the myoelectricity signal accompanied with a wearer's muscular line activity; characterized in that the device further comprises: a control unit (4, 14, 24) configured to generate a command signal for causing the actuator to generate power according to a wearer's intention by using the nerve transfer signal and the myoelectricity signal which are acquired by the biosignal processing unit; and a driving current generating unit configured to generate a current according to the nerve transfer signal and a current according to the myoelectricity signal, respectively, based on the command signal generated by the control unit, to supply the respective currents to the actuator, wherein the biosignal processing unit comprises: a unit configured to amplify the biosignal; a first filter configured to extract the nerve transfer signal from the biosignal; and a second filter configured to extract the myoelectricity signal from the biosignal. a control unit (4, 14, 24) configured to generate a command signal for causing the actuator to generate power according to a wearer's intention by using the nerve transfer signal and the myoelectricity signal which are acquired by the biosignal processing unit; and a driving current generating unit configured to generate a current according to the nerve transfer signal and a current according to the myoelectricity signal, respectively, based on the command signal generated by the control unit, to supply the respective currents to the actuator, a unit configured to amplify the biosignal; a first filter configured to extract the nerve transfer signal from the biosignal; and a second filter configured to extract the myoelectricity signal from the biosignal.