A carriage assembly of a hard disk drive is constructed so that the bonding of flying leads of a long tail suspension circuit board and bonding terminals of a flexible printed circuit board can be carried out uniformly and reliably, and the problem of the flying leads breaking when the flying leads are pulled off the bonding terminals does not occur. The flexible printed circuit board is attached to a reinforced part by an adhesive in which spacers with a substantially equal particle diameter are mixed, and the flying leads and the bonding terminals are bonded together by ultrasonic bonding by applying ultrasonic vibration in a state where the flying leads are pressed onto the bonding terminals. In addition, an insulating film is provided on an opposite surface of the flying leads to the surface bonded to the bonding terminals, and during the ultrasonic bonding, ultrasonic vibration is applied in a state where the flying leads are pressed via the insulating film onto the bonding terminals.

 
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