Suspension assembly, head suspension assembly and disk device with the same

A suspension assembly comprising:

• a support plate;
• a trace member provided on the support plate;
• and
• an expandable/contractable drive element mounted on the trace member,
• the trace member further comprising a metal plate including an end portion fixed to the support plate, and a multilayered member on the metal plate,
• the multilayered member comprising a first insulating layer, a conductive layer stacked on the first insulating layer, and a second insulating layer stacked on the conductive layer, and including a mount portion on which the drive element is mounted, and a branching portion arranged along the mount portion with a gap therebetween, wherein
• the branching portion comprises at least one portion formed into a thin portion having a thickness less than other portions of the multilayered member.