Piezoelectric resonator in a small-sized package

A packaged piezoelectric resonator comprising:

• a case with a lid and a piezoelectric resonator element housed in said case, the piezoelectric resonator element including:
• a planar tuning-fork-shaped part with two parallel vibrating arms connected to each other by a linking part;
• and
• an attachment arm extending from said linking part along the plane of said planar tuning-fork-shaped part, said attachment arm being fixedly attached to the bottom of said case through at least one attachment point, and at least a main portion of said attachment arm being arranged parallel and side by side with said vibrating arms,
• wherein the inside surface of the lid is stepped in such a way as to form a first portion where the lid has a first thickness and a second portion where the lid has a second thickness substantially greater than the first thickness, the first portion extending at least over distal end portions of the vibrating arms, and the second portion extending at least over a part of the attachment arm.