An assistance apparatus includes wires that couple an upper body belt to be worn on an upper body of a user to first and second knee belts to be worn above left and right knees of the user, and a motor. In a case of assisting the user in turning left, the motor generates a tension in second and fourth wires in a period of 65% or more and 100% or less of a first gait phase of a left leg and a period of 0% or more and 20% or less of a second gait phase of the left leg, and generates a tension in sixth and eighth wires in a period of 65% or more and 100% or less of a first gait phase of a right leg and a period of 0% or more and 20% or less of a second gait phase of the right leg.