[Problem] To provide a rubber strip manufacturing apparatus in which damage such as cracks that occur in the outer layer of ceramic calendar rolls can be limited and rubber strips can be continuously rolled for long periods. [Solution] A rubber strip manufacturing apparatus (1) equipped with: a rubber extruder (2) with a discharge opening (2a) for continuously discharging rubber; and a pair of upper and lower calendar rolls (3, 3) for rolling the rubber discharged from the discharge opening (2a) to form a rubber strip (G). Each calendar roll (3) comprises a roll body (7), which is rotated, and a cylindrical outer layer (8), which is disposed concentrically on the outside of the roll body (7) and rolls the rubber with the outer circumferential surface (8S). The outer layer (8) is ceramic. A gap (P) is provided between the outer layer (8) and the roll body (7). O-rings (10) for rotating the outer layer (8) as a unit with the roll body (7) are placed in the gap (P).