A triple force engine is provided to rotate continuously a rotatable rod by operating pendulum weights arranged at both ends of the rotatable rod and generating moment at the rotatable rod. A triple force engine includes a rotatable rod(1), pendulum weights(2), and four lines(3'). The rotatable rod has both ends formed symmetrically from a rotation axis, and equipped with two permanent magnets(1a). The pendulum weights have permanent magnets arranged at both ends of the rotatable rod such that the permanent magnets of the pendulum weights interact with the gravity of earth and the permanent magnets fixed at both ends of the rotatable rod and generate moment by unbalancing the rotatable rod. The lines controls the pendulum weights such that the rotatable rod rotates continuously.
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