Ultrasonic element and ultrasonic device

An ultrasonic element, comprising:

• a substrate in which an opening is formed;
• a vibrating plate provided at the substrate, the vibrating plate including a first surface in contact with the substrate, and the vibrating plate blocking the opening;
• a piezoelectric element provided at a second surface, on an opposite side from the first surface, of the vibrating plate;
• a protective substrate facing the second surface and protecting the piezoelectric element;
• and
• a suppressing unit provided between the protective substrate and the vibrating plate, the suppressing unit configured to suppress a vibration of the vibrating plate, wherein
• in the piezoelectric element, a first electrode, a piezoelectric layer, and a second electrode are stacked in this order from the second surface,
• an active part is a part of the vibrating plate where the first electrode overlaps the piezoelectric layer and the second electrode,
• the suppressing unit is provided around the active part in plan view from a stacking direction,
• a slit is formed in the protective substrate,
• the slit allows gas inside a space enclosed by the vibrating plate, the protective substrate, and the suppressing unit to move to outside of the space and communicate with an outside atmosphere, and
• the slit has a groove shape that does not penetrate through the protective substrate.