To reduce the number of components and assembly man-hours of a brush mechanism in a multipole DC rotating electric machine and to achieve the high output of the rotating electric machine while reducing its size and weight.

In a multipole series wave winding rotating electric machine having a stator with a plurality of (2p, where p denotes an even number not less than 4) poles N1, S1, N2, S2, N1', S1', etc., there are provided a multiwinding series wave winding rotor in which (2p±p/2) coils are provided, winding ends and winding stars of (p/2) rotor coils 1, 2, 3; 1', 2', and 3' subjected to the same electromagnetic actions are connected in series to each other to form coil groups for respective poles, winding starts and winding ends of the coil groups are respectively connected to commutator segments arranged at magnetically symmetrical positions, and every third commutator segment (if the number of windings is [p-1]) or every fifth commutator segment (if the number of windings is [p+1]) of all the commutator segments are short-circuited and a pair of brush mechanisms B1 and B2 brought into contact with the commutator segments.