Piezoelectric thin-film resonator and filter using the same

A filter comprising:

• resonators that connected to form a filter and have a device substrate,
• each of the resonators including:
• a film laminate formed on the device substrate, the film laminate including a lower electrode, a piezoelectric film provided on the device substrate and the lower electrode, and an upper electrode provided on the piezoelectric film,
• at least one of the upper and lower electrodes having an electrode leading portion that extends from an membrane in which the upper electrode overlaps with the lower electrode through the piezoelectric film and has a width narrower than that of the membrane.