Filter and filter device

A filter comprising:

• a filter base portion having a first main surface and a second main surface opposite to the first main surface, the filter base portion defining multiple first through-holes penetrating between the first main surface and the second main surface and one or multiple second through-holes penetrating between the first main surface and the second main surface, the one or multiple second through-holes being larger in size than the multiple first through-holes,
• the filter base portion having a first region positioned on a center side of a filter, a second region positioned on an outer periphery side of the filter relative to the first region and positioned on the center side relative to an outer periphery of the filter, and a third region positioned between the second region and the outer periphery of the filter,
• the one or multiple second through-holes are provided in the second region, and
• a ratio of an opening area of the one or multiple second through-holes is 2×10−5 times to 0.1 times a ratio of an opening area of the multiple first through-holes,
• wherein the filter has a circular shape having a center point,
• the first region has a circular shape centered on the center point of the filter,
• the second region has an annular shape centered on the center point of the filter, and
• an outer diameter of the second region is 0.11 times to 0.84 times a diameter of the filter.