Crystal unit with built-in temperature sensor

A crystal unit with a built-in temperature sensor in a single chamber structure, comprising:

• a container, in which an AT-cut quartz-crystal vibrating piece is mounted;
• a depressed portion, disposed in a portion on a bottom surface side of the container, the depressed portion being for mounting a temperature sensor;
• the AT-cut quartz-crystal vibrating piece, being in a quadrilateral shape in plan view and mounted in the container;
• the temperature sensor, mounted in the depressed portion;
• two adhesion pads, disposed at portions corresponding to a peripheral area of the depressed portion of the container along a first direction;
• and
• a pedestal made of a crystal, disposed between the two adhesion pads and the AT-cut quartz-crystal vibrating piece, adhered to the two adhesion pads on one end side of one surface, and adhered to the AT-cut quartz-crystal vibrating piece at two positions along an X-axis of a crystal or at two positions along a Z′-axis of the crystal on the other surface,
• wherein
• depending on whether the AT-cut quartz-crystal vibrating piece is adhered to the pedestal at the two positions along the X-axis or is adhered to the pedestal at the two positions along the Z′-axis, the pedestal made of the crystal has the X-axis or one of the Z′-axis or a Z-axis of the crystal in a direction parallel to a plane, and is adhered to the two adhesion pads in a positional relationship in which the axis of the pedestal is parallel to the first direction, where, the Z′-axis is an axis displaced from a true Z-axis of the crystal derived from a cut angle of an AT-cut crystal element.