A brushless slotless electric motor comprising: a stator that includes a stator core and a plurality of coils, the plurality of coils being disposed at an inner circumference side of the stator core; a rotor that includes a shaft, the rotor being rotated around the shaft with respect to the stator; and a medium pathway suitable for passing a medium for a drive target of the electric motor, the medium including a fluid or an electric wire or light and being suitable for being used for actualizing a function of the drive target of the electric motor, wherein the plurality of coils are adjacent to each other in a rotation direction of the rotor so as not to lap mutually, and the medium pathway is disposed between the adjacent coils, wherein the medium pathway is formed at a border gap between two adjacent coils from the plurality of coils, and the electric motor further comprises a holder member that holds the plurality of coils, wherein the holder member includes: - a cylinder portion, the plurality of coils being disposed on an outer circumference of the cylinder portion; and - flanges at both ends of the holder member, which flanges (38, 39) are formed integrally with the cylinder portion to project from the cylinder portion in a radially outward direction, the medium pathway penetrates the flanges, - further comprising convex portions that are provided so as to protrude from the outer circumference portion of the cylinder portion, wherein the coils are each fitted to a convex portion, respectively, wherein the convex portions are positioned in the opening of each of the coils for positioning and holding in the circumferential direction and axial direction of the coils, wherein a hole through which the medium pathway passes is respectively formed on each flange of the holder member. a stator that includes a stator core and a plurality of coils, the plurality of coils being disposed at an inner circumference side of the stator core; a rotor that includes a shaft, the rotor being rotated around the shaft with respect to the stator; and a medium pathway suitable for passing a medium for a drive target of the electric motor, the medium including a fluid or an electric wire or light and being suitable for being used for actualizing a function of the drive target of the electric motor, wherein the plurality of coils are adjacent to each other in a rotation direction of the rotor so as not to lap mutually, and the medium pathway is disposed between the adjacent coils, wherein the medium pathway is formed at a border gap between two adjacent coils from the plurality of coils, and the electric motor further comprises a holder member that holds the plurality of coils, wherein the holder member includes: - a cylinder portion, the plurality of coils being disposed on an outer circumference of the cylinder portion; and - flanges at both ends of the holder member, which flanges (38, 39) are formed integrally with the cylinder portion to project from the cylinder portion in a radially outward direction, the medium pathway penetrates the flanges, - further comprising convex portions that are provided so as to protrude from the outer circumference portion of the cylinder portion, wherein the coils are each fitted to a convex portion, respectively, wherein the convex portions are positioned in the opening of each of the coils for positioning and holding in the circumferential direction and axial direction of the coils, - a cylinder portion, the plurality of coils being disposed on an outer circumference of the cylinder portion; and - flanges at both ends of the holder member, which flanges (38, 39) are formed integrally with the cylinder portion to project from the cylinder portion in a radially outward direction, the medium pathway penetrates the flanges, - further comprising convex portions that are provided so as to protrude from the outer circumference portion of the cylinder portion, wherein the coils are each fitted to a convex portion, respectively, wherein the convex portions are positioned in the opening of each of the coils for positioning and holding in the circumferential direction and axial direction of the coils, wherein a hole through which the medium pathway passes is respectively formed on each flange of the holder member.