Electric motor and dental device

A brushless 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;
• a medium pathway through which a medium passes, the medium being used for actualizing a function of an application object of the electric motor;
• and
• a holder member that holds the plurality of coils,
• wherein the plurality of coils are adjacent to each other in a rotation direction of the rotor so as not to lap mutually,
• wherein the medium pathway is disposed between the adjacent coils,
• wherein the holder member includes:
• a cylinder portion, the plurality of coils being disposed on an outer circumference of the cylinder portion, and
• a flange that is formed integrally as a single unit with the cylinder portion to project from the cylinder portion in a radially outward direction, and
• a plurality of convex portions that are arranged to protrude from the outer circumference of the cylinder portion, wherein each of the plurality of coils is configured to be fitted to one of the plurality of convex portions, and
• wherein the medium pathway penetrates the flange.