1. A piezoelectric device, comprising:a base, having a depressed portion and a bank portion;
a piezoelectric vibrating piece, housed within the depressed portion; and
a cover, bonded on a top surface of the bank portion of the base with a sealing metal,
wherein the top surface of the base has:
an inclined surface that inclines down toward an inside of the base in a direction along a width direction of the bank portion, or
an inclined surface that inclines down toward an outside of the base in the direction along the width direction of the bank portion,
wherein the inclined surface inclines at an angle of ? that is provided by a horizontal surface and the inclined surface,
where two degrees???six degrees.