Housing body with functional component, and tire

A tire, comprising:

• a functional component configured to acquire tire information;
• and
• a housing body adapted to house the functional component,
• the housing body being fixed to a tire inner surface,
• the functional component being housed in the housing body,
• the functional component comprising a housing containing an electronic component, and a piezoelectric element having a film-shape and being fixed to a wall surface of the housing,
• at least one projection being formed on an inner surface of the housing body, and at least a part of the projection and the piezoelectric element being directly in contact with each other or indirectly in contact with each other via the wall surface of the housing in an unloaded state of the tire, and
• in a top view of the projection, an area of a bottommost surface of the projection being larger than an area of an uppermost portion of the projection, and an outer edge of the uppermost portion of the projection being located on an inner side of an outer edge of the bottommost surface of the projection, wherein
• a bottom surface of the functional component is not fitted to the projection, and
• each of the projection and the piezoelectric element have a smaller cross-sectional width than cross-sectional widths of each of the housing body and the functional component.