A permanent magnet type machine having: a rotor rotatable around a rotation axis having a plurality of magnetic poles composed of permanent magnets, wherein the rotor comprises an integral type massive rotor yoke; and a stator having armature windings concentratedly wound around teeth, characterized in that: when the number of pole pairs of the rotor is P, an outer diameter of the rotor is D[m], N is a spatial harmonic order of a predetermined asynchronous component of an armature magnetomotive force of the stator, wherein the predetermined asynchronous component being the cause of eddy current loss and having the largest magnitude in a Fourier series of the magnetomotive force (a mechanical angle 360 degrees is decided as 1-st order), wherein the magnitude of the spatial harmonic order is normalized by the magnitude of the synchronous component of the 1-st order, and an output of the permanent magnet type machine is P out [kW], wherein the diameter D is made equal to or larger than 0.00045P out + 1.2, when a core length L of the machine is less than or equal to the diameter D, a parameter X (its unit is m) which is correlated with and gives an indication of the rate of an eddy current loss caused in the rotor is defined as follows: X = N + P 1.5 N − 4 P 2 D and values of the P, D and N are selected so that a value of the parameter X and thus the eddy current loss becomes smaller than 0.6. a rotor rotatable around a rotation axis having a plurality of magnetic poles composed of permanent magnets, wherein the rotor comprises an integral type massive rotor yoke; and a stator having armature windings concentratedly wound around teeth, characterized in that: when the number of pole pairs of the rotor is P, an outer diameter of the rotor is D[m], N is a spatial harmonic order of a predetermined asynchronous component of an armature magnetomotive force of the stator, wherein the predetermined asynchronous component being the cause of eddy current loss and having the largest magnitude in a Fourier series of the magnetomotive force (a mechanical angle 360 degrees is decided as 1-st order), wherein the magnitude of the spatial harmonic order is normalized by the magnitude of the synchronous component of the 1-st order, and an output of the permanent magnet type machine is P out [kW], wherein the diameter D is made equal to or larger than 0.00045P out + 1.2, when a core length L of the machine is less than or equal to the diameter D, a parameter X (its unit is m) which is correlated with and gives an indication of the rate of an eddy current loss caused in the rotor is defined as follows: X = N + P 1.5 N − 4 P 2 D and values of the P, D and N are selected so that a value of the parameter X and thus the eddy current loss becomes smaller than 0.6. when the number of pole pairs of the rotor is P, an outer diameter of the rotor is D[m], N is a spatial harmonic order of a predetermined asynchronous component of an armature magnetomotive force of the stator, wherein the predetermined asynchronous component being the cause of eddy current loss and having the largest magnitude in a Fourier series of the magnetomotive force (a mechanical angle 360 degrees is decided as 1-st order), wherein the magnitude of the spatial harmonic order is normalized by the magnitude of the synchronous component of the 1-st order, and an output of the permanent magnet type machine is P out [kW], wherein the diameter D is made equal to or larger than 0.00045P out + 1.2, when a core length L of the machine is less than or equal to the diameter D, a parameter X (its unit is m) which is correlated with and gives an indication of the rate of an eddy current loss caused in the rotor is defined as follows: X = N + P 1.5 N − 4 P 2 D