Drum-type commutator are the same as the support member (1) and a plurality of metallic conductor segments (3, 3 ') and terminal and the conductor segments lugs (8) provided thereon of the sheath-shaped made of insulating molding material It becomes because the number of carbon material segment (4), the carbon material segment is coupled to the conductive and the conductor segments (3, 3 '). The commutator is disposed adjacent to the terminal lugs (8), and a molding material zones and metal zones comprise alternating, ring-shaped, closed shape, and a substantially cylindrical surface (19), the support member and an inner surface of the metallized carbon material segment connecting (4). When manufacturing of the drum-type commutator, the conductor segments (3) is suitable to be coupled to the conductor material cast member via the first bridging member, the bridging member is after combining the conductive material cast member and carbon material sleeve It is removed.