A disk unit has a voice coil motor to oscillate a suspension arm mounted at the
leading end of a head with respect to a disk. The voice coil motor has a voice
coil integrally attached to the tail end of the suspension arm, a magnet to cause
a magnetic field to act on the voice coil, and a pair of yokes provided in such
a positional relationship that the voice coil and magnet are sandwiched therebetween.
At least one yoke has a roughly fan-shaped main body and a plate piece portion
provided in a condition extended from one end side of the main body. After the
formation of the main body and plate piece portion by press working, the yoke is
formed by folding the plate piece portion on the main body.
