A permanent magnet type motor comprising: a stator composed of armature windings (40,41) and a stator core having a slot that incorporates each of said armature windings (40,41); and a rotor composed of a rotor core provided on the inner circumferential side of said stator via an air gap and configured by laminating electromagnetic steel sheets, a plurality of permanent magnets fixed at intervals on a circumferential surface portion of said rotor core, and a shaft that passes through along a center axis line of said rotor core, wherein a protrusion of said rotor core is provided between two adjacent permanent magnets and is extending in axial direction, and an air gap is formed between said protrusion and said permanent magnet, and when the number of poles of said permanent magnets is set to P and the number of said slots is set to N, the relationship of P:N=2n:12n is established, where n is an integer equal to or more than 2; characterized in that an air gap length between the inner circumference of said stator core and the outer circumference of said permanent magnets is less than or equal to 1.0 mm; said permanent magnets do not contain a heavy rare earth element and are embedded in said rotor core with the lateral sides of said permanent magnet being surrounded by said protrusions except for a curve portion of an outer circumference portion; an outer diameter of said motor is 80 to 100 mm, an output thereof is 400 to 900 W, and a circumferential center thickness of said permanent magnet is 2.4 to 4.2 mm; and when a circumferential center thickness of said permanent magnet is set to t and a circumferential length of said permanent magnet is set to Wm, the relationship of t/Wm≥0.2 is established; and when a height of said protrusion provided between said permanent magnets is set to Wc and a thickness of circumferential both end portions of said permanent magnet is set to We, the relationship of 1.8 mm≤We≤Wc is established. a stator composed of armature windings (40,41) and a stator core having a slot that incorporates each of said armature windings (40,41); and a rotor composed of a rotor core provided on the inner circumferential side of said stator via an air gap and configured by laminating electromagnetic steel sheets, a plurality of permanent magnets fixed at intervals on a circumferential surface portion of said rotor core, and a shaft that passes through along a center axis line of said rotor core, wherein a protrusion of said rotor core is provided between two adjacent permanent magnets and is extending in axial direction, and an air gap is formed between said protrusion and said permanent magnet, and when the number of poles of said permanent magnets is set to P and the number of said slots is set to N, the relationship of P:N=2n:12n is established, where n is an integer equal to or more than 2; characterized in that an air gap length between the inner circumference of said stator core and the outer circumference of said permanent magnets is less than or equal to 1.0 mm; said permanent magnets do not contain a heavy rare earth element and are embedded in said rotor core with the lateral sides of said permanent magnet being surrounded by said protrusions except for a curve portion of an outer circumference portion; an outer diameter of said motor is 80 to 100 mm, an output thereof is 400 to 900 W, and a circumferential center thickness of said permanent magnet is 2.4 to 4.2 mm; and when a circumferential center thickness of said permanent magnet is set to t and a circumferential length of said permanent magnet is set to Wm, the relationship of t/Wm≥0.2 is established; and when a height of said protrusion provided between said permanent magnets is set to Wc and a thickness of circumferential both end portions of said permanent magnet is set to We, the relationship of 1.8 mm≤We≤Wc is established.