PROBLEM TO BE SOLVED: To provide, as a main objective, a metal thin plate for suspension having excellent connectivity with an actuator arm and electric connection stability with a piezoelectric device.SOLUTION: A metal thin plate for suspension has a metal base, and supports a substrate for suspension. The metal base is made of austenitic stainless steel. The metal base includes: a first area including a boss part used for connecting with an actuator arm; and a second area including a connecting part to a piezoelectric device and having lower chrome fraction to iron than the first area.