An inkjet apparatus capable of achieving a good withstand voltage in a movable part of a piezoelectric element is provided. An inkjet apparatus (1) is provided, wherein the inkjet apparatus (1) comprises: an actuator substrate (2), partitioning a cavity (5) for accumulating ink; a vibrating film (6), supported by the actuator substrate (2) and partitioning the cavity (5); and a piezoelectric element (7), on the vibrating film (6), and comprising an upper electrode (20), a lower electrode (18), and a piezoelectric film (19) between the upper electrode (20) and the lower electrode (18); wherein the piezoelectric film (19) extends along a space covering the whole cavity (5); and the upper electrode (20) is constrained in an inner space of the cavity.