The utility model provides a motor which has a structure that can restrain the vibration and noise that produces because of the rotation of rotor. In a mode of the rotor of the utility model, the magnet patchhole portion as supplying permanent magnet male hole between the circumference of adjacent iron core piece portion are provided. Moulded resin portion has set up one first guide portion at least in magnet patchhole portion. First guide portion lies in the position of leaning on circumference one side than the center between adjacent iron core piece portion in circumference, and covers face partly at least of circumference one side of magnet patchhole portion. The distance between the tip of the circumference opposite side of the first guide portion and the circumference between the iron core piece portion of the circumference opposite side of magnet patchhole portion is set as L1, the size of permanent magnet's circumference is set as L2, and the distance between the tip of the circumference opposite side of first guide portion and the circumference between the iron core piece portion of circumference one side of magnet patchhole portion is set as L3, and the relation(L1-L2)