Provided are an electric motor that enables to promote a further downsizing and performance enhancement, and a dental device that includes the electric motor. A brushless slotless electric motor 10 includes: a stator 3 that includes a stator core 301 and a plurality of coils 31 to 33, the plurality of coils 31 to 33 being disposed at an inside of the stator core 301； a rotor 2 that includes a shaft 21, the rotor 2 being rotated around the shaft 21 with respect to the stator 3； and a medium pathway 40 through which a medium passes, the medium being supplied for actualizing a function of a dental handpiece 9A to which the electric motor 10 is applied. The plurality of coils 31 to 33 are adjacent to each other in a rotation direction of the rotor 2 so as not to lap mutually. The medium pathway 40 is disposed between the adjacent coils 31 to 33.
