To provide an endless orbital motion structure for enabling revolving circular motion greater than conventional one without changing a revolving range and a size.

As shown in a B-B cross section, an elliptical frame (1) is constituted as the base of the structure with totally four semi-circles, namely, upper and lower radial circles (α) each having a greater radius and right and left radial circles (β) each having a smaller radius, where an elliptical smooth outer peripheral face (γ) is formed into a convex shape (ε). On the elliptical orbital face (γ) of the constituted elliptical frame (1), a link mechanism orbital body (4) having endless linkage is installed. A concave shape (δ) of the revolution face of such an orbit holding revolving body (19) that the elliptical orbital face (γ) is incorporated in the connection axis (6) of the link mechanism endless orbital body (4) is matched to the convex shape (ε) of the outer peripheral face (1) of the elliptical frame (1) to enable smooth elliptical endless orbital motion while avoiding the shift of an orbit during the endless orbital motion of the link mechanism endless orbital body (4).

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