To change the orientation of a connector into a plurality of different directions without changing the orientation of a frame in a robot controller including the connector on the external surface of the frame.

An aperture 10 extending over three planes is formed on one of vertexes of the frame 2 of the robot controller, and a variable connector 6 is provided to be rotatable on the aperture 10. The variable connector 6 is structured integrally of a spherical housing 11 and a fitting part 12 eccentrically protruding from part of the external surface of the housing. A plurality of pairs of engaging recesses arranged so as to be point-symmetrical with respect to the center of the sphere to make pairs are provided on the external surface of the spherical housing 11. A holding part 16 detachably engaging with one engaging recess is provided on an upper side of the aperture 10 on a front face of the frame 2. A holding member 17 made of a leaf spring is provided, which has an engaging protrusion 17a positioned behind the spherical housing 11 in the frame 2 and engages with the engaging recess of its counterpart.

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