PURPOSE: A flexible printed circuit board of a spindle motor is provided to remove a UV bonding process by installing an upper reinforcing plate and a lower reinforcing plate at a solder part having a valve structure. CONSTITUTION: A coil extended from a stator core penetrates a through hole of a solder part(111). A separation part is formed at the solder part. The separation part is opened or closed to only one side including the through hole. An upper reinforcing plate(111a) is used for supporting an upper portion of the separation part. A lower reinforcing plate(111d) is used for supporting a lower portion of the solder part. The lower reinforcing plate is partially overlapped with the through hole. An oval penetration part having an elliptic shape is formed at the lower reinforcing plate.
