Vibration element, physical quantity sensor, inertial measurement unit, electronic apparatus, and vehicle

A vibration element comprising:

• three axes orthogonal to each other being defined as an X-axis, a Y-axis, and a Z-axis;
• a base;
• and
• a vibrating arm extending from the base to a positive side of the Y-axis, wherein the vibrating arm is configured with:
• a weight;
• an arm positioned between the base and the weight;
• and
• a weight film disposed on the weight, the weight includes a first principal surface and a second principal surface that are perpendicular to the Z-axis and have a front and back relationship with each other,
• wherein a plane passing through a center of the arm in a Z-axis direction along the Z-axis and parallel to an X-Y plane containing the X-axis and the Y-axis is defined as a center plane,
• a center of gravity of the weight is on a first principal surface side with respect to the center plane, and
• a center of gravity of the weight film is on a second principal surface side with respect to the center surface,
• wherein the weight includes a first portion and a second portion, and the second portion is thinner than the first portion in the Z-axis direction,
• wherein the second principal surface has a stepped shape formed by the first portion and the second portion, and
• the second portion is arranged in a region from an end of the first portion on the positive side of the Y axis to an end of the weight on the positive side of the Y axis in a plan view from the Z-axis direction.