To provide a revolution position detector capable of preventing a rotor from inclining by the pushing pressure of a contact lever or the repulse force based on the pushing pressure and a motor provided with the detector.

The relation among pressing forces F1, F2 and F3 at contact points 48b, 49b and 50b of first to third contact levers 48, 49 and 50, the X- coordinates X1, X2 and X3 and the Y-coordinates Y1, Y2 and Y3 of the contact points 48b, 49b and 50b from the origin of the X-Y coordinates set at the revolution axis center L of a contact plate 25 is set to fulfill the following conditional equations. F1×X1+F2×X2+F3×X3=0 and F1×Y1+F2×Y2+F3×Y3=0.