To provide an actuator device having improved response properties of vibration and durability, and to provide a fluid injecting head.

The actuator device has a piezoelectric element comprising a lower electrode provided at one surface side of a substrate, a piezoelectric layer provided on the lower electrode, and an upper electrode provided on the piezoelectric layer; and the lower electrode. The lower electrode has a density elasticity adjustment layer made of an alloy of Pt and TiOX (0.1x2).