A motor comprising: a rotor being provided to abut an outer circumference of a shaft; and a stator being disposed outside of the rotor to be away from the rotor at a certain gap, the stator including: a stator core having an annular shape; teeth respectively protruding from the stator core toward the rotor in a radial direction; and coils (U11 to U41, V12 to V42, W11 to W41) respectively wound onto the teeth and forming n (n is an integer of 2 or greater) turns including first to n-th turns, said coils (U11 to U41, V12 to V42, W11 to W41) being wound by concentrated winding, wherein a first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies most adjacent to the rotor, and a k-th (k is an integer, 1 < k ≤ n) turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies closer to the stator core than the first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41), wherein: the first turn, when each of the coils (U11 to U41, V12 to V42, W11 to W41) is cut in the radial direction, is greater in cross-sectional area than each of the k-th turn and the n-th turn, and the shaft internally includes a hollow part serving as a passage for a refrigerant used to cool inside the motor. a rotor being provided to abut an outer circumference of a shaft; and a stator being disposed outside of the rotor to be away from the rotor at a certain gap, the stator including: a stator core having an annular shape; teeth respectively protruding from the stator core toward the rotor in a radial direction; and coils (U11 to U41, V12 to V42, W11 to W41) respectively wound onto the teeth and forming n (n is an integer of 2 or greater) turns including first to n-th turns, said coils (U11 to U41, V12 to V42, W11 to W41) being wound by concentrated winding, wherein a first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies most adjacent to the rotor, and a k-th (k is an integer, 1 < k ≤ n) turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies closer to the stator core than the first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41), wherein: the first turn, when each of the coils (U11 to U41, V12 to V42, W11 to W41) is cut in the radial direction, is greater in cross-sectional area than each of the k-th turn and the n-th turn, and the shaft internally includes a hollow part serving as a passage for a refrigerant used to cool inside the motor. a stator core having an annular shape; teeth respectively protruding from the stator core toward the rotor in a radial direction; and coils (U11 to U41, V12 to V42, W11 to W41) respectively wound onto the teeth and forming n (n is an integer of 2 or greater) turns including first to n-th turns, said coils (U11 to U41, V12 to V42, W11 to W41) being wound by concentrated winding, wherein a first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies most adjacent to the rotor, and a k-th (k is an integer, 1 < k ≤ n) turn of each of the coils (U11 to U41, V12 to V42, W11 to W41) lies closer to the stator core than the first turn of each of the coils (U11 to U41, V12 to V42, W11 to W41), wherein: the first turn, when each of the coils (U11 to U41, V12 to V42, W11 to W41) is cut in the radial direction, is greater in cross-sectional area than each of the k-th turn and the n-th turn, and the shaft internally includes a hollow part serving as a passage for a refrigerant used to cool inside the motor.