A double-row self-aligning roller bearing (1, 1A, 1B) comprising an inner ring; an outer ring having a spherical raceway surface; and rollers (4, 5) in two rows arranged in a bearing width direction interposed between the inner ring and the outer ring, the rollers (4, 5) in two rows each having an outer peripheral surface of a cross-sectional shape along the raceway surface of the outer ring, wherein each roller (4, 5) in one row of the two rows has a length different from that of each roller (4, 5) in the other row of the two rows, the length of the longer rollers is equal to or greater than 39% of a bearing width, a ratio of a contact angle θ1 of the shorter rollers relative to a contact angle θ2 of the longer rollers is within a range of 1:4 to 1:2, and each of the rollers (4, 5) in two rows is an asymmetrical roller having a maximum diameter (D1 max, D2 max) at a position displaced from a center of a roller length (A1, A2) thereof to a center side relative to a bearing axial direction, and an intermediate flange configured to guide the rollers (4, 5) in two rows is provided between the two rows of the rollers (4, 5) on an outer peripheral surface of the inner ring wherein the intermediate flange is provided between the two rows of the rollers (4, 5) on an outer peripheral surface of the inner ring, and the intermediate flange has a center position in the bearing width direction displaced toward a side of the longer roller from a position of a point in the bearing width direction at which lines of action defining the contact angles (θ1, θ2) of the respective rows intersect, and each roller in one row of the two rows has a maximum diameter equal to that of each roller in the other row of the two rows. an outer ring having a spherical raceway surface; and rollers (4, 5) in two rows arranged in a bearing width direction interposed between the inner ring and the outer ring, the rollers (4, 5) in two rows each having an outer peripheral surface of a cross-sectional shape along the raceway surface of the outer ring, wherein each roller (4, 5) in one row of the two rows has a length different from that of each roller (4, 5) in the other row of the two rows, the length of the longer rollers is equal to or greater than 39% of a bearing width, a ratio of a contact angle θ1 of the shorter rollers relative to a contact angle θ2 of the longer rollers is within a range of 1:4 to 1:2, and each of the rollers (4, 5) in two rows is an asymmetrical roller having a maximum diameter (D1 max, D2 max) at a position displaced from a center of a roller length (A1, A2) thereof to a center side relative to a bearing axial direction, and an intermediate flange configured to guide the rollers (4, 5) in two rows is provided between the two rows of the rollers (4, 5) on an outer peripheral surface of the inner ring wherein the intermediate flange is provided between the two rows of the rollers (4, 5) on an outer peripheral surface of the inner ring, and the intermediate flange has a center position in the bearing width direction displaced toward a side of the longer roller from a position of a point in the bearing width direction at which lines of action defining the contact angles (θ1, θ2) of the respective rows intersect, and each roller in one row of the two rows has a maximum diameter equal to that of each roller in the other row of the two rows.