A method of controlling an artificial knee joint provided with a thigh joint part provided on a side of a thigh part and with a lower leg part coupled to the thigh joint part and provided to be rotatable around a knee shaft, the method including:
- acquiring an inclination angle formed by the thigh part relative to a vertical line passing through the knee shaft;
- and
- weakening a rotational resistance of the knee shaft in accordance with a transition from a positive inclination angle formed when the thigh part is inclined rearward relative to the vertical line to a negative inclination angle formed when the thigh part is inclined forward relative to the vertical line.