Connection structure and parallel link robot

A connection structure interconnecting two links, the two links having longitudinal axes and being spaced apart from each other in parallel and operated, the connection structure comprising:

• bushings attached to the links so as to be rotatable about an axis perpendicular to a plane containing the two longitudinal axes;
• a biasing mechanism spanning between the bushings of the two links and applying an elastic restoring force to the two bushings in a direction in which the two bushings move closer together;
• and
• a connection member having two attachment holes through which the bushings can pass in a direction of the axis and regulating a distance between the bushings to be less than or equal to a prescribed distance,
• wherein the bushings include claw portions projecting radially outward at part of, in a peripheral direction, an end portion of each of the bushings in the direction of the axis,
• the attachment holes are formed in a shape allowing the bushings to pass therethrough only at a prescribed attachment phase around the axis coinciding with the claw portions of the bushings, and
• a phase of the bushings around the axis is regulated by the elastic restoring force to a phase that does not match the attachment phase.