A rotational electric machine comprising: a rotation axis extending in an axial direction; a radial direction, wherein the rotation axis is defined as the center of the radial direction; a circumferential direction along a rotation direction of the rotational electric machine; an iron core having a plurality of slots; and a plurality of conductive segments forming coils, the conductive segments being arranged in the slots, wherein the iron core includes a coil guide (3, 3a, 3b) arranged at, at least, one axial opening portion of the slots, and made of an insulating material, wherein the coil guide (3, 3a, 3b) includes a plurality of slot insertion portions, each inserted into the respective slot and located between the respective slot and the respective conductive segments, at least one separation portion separating the conductive segments and located between the conductive segments, and a flange portion located at one end of the coil guide (3, 3a, 3b) in the axial direction, wherein the flange portion covers a side surface portion of the iron core in the axial direction and comprises a plurality of opening portions, wherein the conductive segments are inserted in the slots through the plurality of opening portions; wherein the plurality of slot insertion portions and the at least one separation portion are arranged in the slots together with the conductive segments; wherein at an axial direction end portion of the plurality of opening portions of the flange portion, a plurality of inclined surfaces, each facing the respective slot, is provided in the circumferential direction, characterized in that inclined surfaces facing one side of the slot in the circumferential direction and inclined surfaces facing the other side of the slot in the circumferential direction are located alternately in the radial direction. a rotation axis extending in an axial direction; a radial direction, wherein the rotation axis is defined as the center of the radial direction; a circumferential direction along a rotation direction of the rotational electric machine; an iron core having a plurality of slots; and a plurality of conductive segments forming coils, the conductive segments being arranged in the slots, wherein the iron core includes a coil guide (3, 3a, 3b) arranged at, at least, one axial opening portion of the slots, and made of an insulating material, wherein the coil guide (3, 3a, 3b) includes a plurality of slot insertion portions, each inserted into the respective slot and located between the respective slot and the respective conductive segments, at least one separation portion separating the conductive segments and located between the conductive segments, and a flange portion located at one end of the coil guide (3, 3a, 3b) in the axial direction, wherein the flange portion covers a side surface portion of the iron core in the axial direction and comprises a plurality of opening portions, wherein the conductive segments are inserted in the slots through the plurality of opening portions; wherein the plurality of slot insertion portions and the at least one separation portion are arranged in the slots together with the conductive segments; wherein at an axial direction end portion of the plurality of opening portions of the flange portion, a plurality of inclined surfaces, each facing the respective slot, is provided in the circumferential direction, characterized in that inclined surfaces facing one side of the slot in the circumferential direction and inclined surfaces facing the other side of the slot in the circumferential direction are located alternately in the radial direction.