Driving device

A driving device comprising:

• a first rotating member driven so as to rotate;
• an armature member being movable in an axial direction thereof together with the first rotating member and being rotatable integrally with the first rotating member;
• a second rotating member facing the armature member in the axial direction thereof and being rotatable relative to the armature member;
• a magnetic force generating means for generating a magnetic force by being energized, the magnetic force being used for attracting the armature member toward the second rotating member in order to establish a connection between the armature member and the second rotating member so as to be integrally rotatable;
• a sensor magnet fixed to the second rotating member for generating a magnetic field that changes in a circumferential direction of the sensor magnet;
• a sensor provided so as to face the sensor magnet in order to detect a change of the magnetic field;
• and
• a fixing member formed with a first claw portion and a second claw portion, the first claw portion engaged with the second rotating member while being press-fitted thereto in a radial direction thereof and the second claw portion engaged with the sensor magnet while being press-fitted thereto in a radial direction thereof, wherein the sensor magnet is fixed to the second rotating member by means of the fixing member.