Sound absorption and insulation structure

A sound absorption and insulation structure, comprising:

• a first surface;
• a second surface disposed opposite the first surface;
• a first hole that is open on the first surface and is not open on the second surface;
• and
• a second hole that is open on the first surface and is not open on the second surface, the second hole differing from the first hole in shape and length, wherein
• the first hole includes a plurality of passage parts connected in series,
• the plurality of passage parts includes:
• a first passage part that is open on the first surface and extends from the first surface toward the second surface along a direction intersecting the first surface;
• a second passage part that extends from an end of the first passage part on a side facing the second surface along a direction intersecting a direction of extension of the first passage part;
• a third passage part that extends from an end of the second passage part on a side away from the first passage part toward the first surface along a direction intersecting a direction of extension of the second passage part;
• a fourth passage part that extends from an end of the third passage part on a side facing the first surface along a direction intersecting a direction of extension of the third passage part;
• and
• a fifth passage part that extends from an end of the fourth passage part on a side away from the third passage part toward the second surface along a direction intersecting a direction of extension of the fourth passage part,
• the second hole includes a plurality of passage parts connected in series,
• the plurality of passage parts of the second hole includes:
• a sixth passage part that is open on the first surface and extends from the first surface toward the second surface along a direction intersecting the first surface;
• a seventh passage part that extends from an end of the sixth passage part on a side facing the second surface along a direction intersecting a direction of extension of the first passage part;
• and
• an eighth passage part that extends from an end of the seventh passage part on a side away from the sixth passage part toward the first surface along a direction intersecting a direction of extension of the seventh passage part, and
• the sound absorption and insulation structure comprises a cavity between the eighth passage part and the first surface.