The invention provides a floating joint which can save space and has a locking mechanism for locking the swing of a movable base with respect to a fixed base. The floating joint (1) includes a fixed base (10); a movable base (20); a floating mechanism (30) that floatingly supports the movable base (20) swingably with respect to the fixed base (10); and a locking mechanism (60) that fixes the movable base (20) in a state of not being swingable with respect to the fixed base (10). The floating mechanism (30) includes a spherical bearing (51) having a spherical surface (511), and a spherical washer part (52) that supports the spherical surface (511) slidably. The locking mechanism (60) is provided in an inner part of the spherical bearing (51).