A two-stage cross roller bearing (1) includes a first cross roller bearing
(10) and a second cross roller bearing (20) that are disposed concentrically
along a plane that is perpendicular to the bearing axis 1a. The inner
ring of the first cross roller bearing (10) and the outer ring of the second
cross roller bearing (20) are formed of a single ring-shaped member (14),
with an inner ring-side raceway groove (13) of the first cross roller bearing
being formed on the circular outer circumferential surface of the ring-shaped member
and an outer ring-side raceway groove (21) of the second cross roller bearing
being formed on the circular inner circumferential surface of the ring-shaped member.
A small, compact, and flat multistage cross roller bearing is realized.