To provide a connection structure sufficiently reducing friction by more effectively feeding a lubricant to a sliding portion by pivoting or turning.

The connection structure is a connection structure provided with: an arm part 2; a spherical part 3 bonded to an end of the arm part 2; a support part 4 for supporting the spherical part 3 such that the arm part 2 is pivoted and turned; and storage parts 8, 9 for storing the lubricant between the support part 4 and the spherical part 3. When the arm part 2 is positioned at a predetermined pivoting or turning position, the spherical part 3 is provided with a recession part 10 opened to the storage part 8.