A rotation drive device comprising: a rotatably provided rotor; and a drive unit (18, 20) for driving said rotor to rotate, said drive unit (18, 20) including a plurality of first magnetic elements provided to face said rotor, a plurality of coils wound around said plurality of first magnetic elements, respectively, for generating rotating magnetic field, said rotor and said drive unit are (18, 20) spaced apart from each other in a direction in which a rotation central axis of said rotor extends, and said plurality of first magnetic elements are aligned in a rotation direction of said rotor, characterized in that a connector for externally receiving a driving voltage, and a flexible substrate connected to said plurality of coils and said connector, said flexible substrate being provided with a wiring pattern (L0 to L3) for supplying said driving voltage externally provided via said connector to said plurality of coils, said flexible substrate is formed in the shape of a strip, said flexible substrate is at least partially arranged to surround outer circumferences of said plurality of coils, and said flexible substrate is provided with a plurality of electrodes for connection with said plurality of coils, said flexible substrate is at least partially arranged cylindrically to surround the outer circumferences of said plurality of coils, with a plurality of clearances formed between an inner circumferential surface of said flexible substrate and outer circumferential surfaces of said plurality of coils, and said plurality of electrodes are arranged in a dispersed manner in said flexible substrate so as to be positioned in said plurality of clearances, said flexible substrate in the shape of a strip includes a plurality of bent portions (23 a) on one side or both sides in a width direction of said flexible substrate, said plurality of bent portions are arranged in a dispersed manner in a length direction of said flexible substrate so as to be positioned in said plurality of clearances, each bent portion being bent into the corresponding clearance, and said plurality of electrodes are formed in said plurality of bent portions. a rotatably provided rotor; and a drive unit (18, 20) for driving said rotor to rotate, said drive unit (18, 20) including a plurality of first magnetic elements provided to face said rotor, a plurality of coils wound around said plurality of first magnetic elements, respectively, for generating rotating magnetic field, said rotor and said drive unit are (18, 20) spaced apart from each other in a direction in which a rotation central axis of said rotor extends, and said plurality of first magnetic elements are aligned in a rotation direction of said rotor, characterized in that a connector for externally receiving a driving voltage, and a flexible substrate connected to said plurality of coils and said connector, said flexible substrate being provided with a wiring pattern (L0 to L3) for supplying said driving voltage externally provided via said connector to said plurality of coils, said flexible substrate is formed in the shape of a strip, said flexible substrate is at least partially arranged to surround outer circumferences of said plurality of coils, and said flexible substrate is provided with a plurality of electrodes for connection with said plurality of coils, said flexible substrate is at least partially arranged cylindrically to surround the outer circumferences of said plurality of coils, with a plurality of clearances formed between an inner circumferential surface of said flexible substrate and outer circumferential surfaces of said plurality of coils, and said plurality of electrodes are arranged in a dispersed manner in said flexible substrate so as to be positioned in said plurality of clearances, said flexible substrate in the shape of a strip includes a plurality of bent portions (23 a) on one side or both sides in a width direction of said flexible substrate, said plurality of bent portions are arranged in a dispersed manner in a length direction of said flexible substrate so as to be positioned in said plurality of clearances, each bent portion being bent into the corresponding clearance, and said plurality of electrodes are formed in said plurality of bent portions.