A filter structure includes: a filter layer that has air permeability to filter passing gas; an adhesive layer formed of an adhesive on at least a part of one side of the filter layer; and a peelable sheet layer laminated on a surface of the adhesive layer, in which a to-be-cut region is set on the filter layer, and a boundary portion indicating a boundary position between the to-be-cut region and a non-cut region of the filter layer is formed on at least one of the sheet layer and the filter layer. The to-be-cut region is cut off at a position indicated by the boundary portion before mounting on a target object, and therefore, the filter structure can be mounted on the target object while avoiding a portion that does not need to be attached to the target object, or a portion that causes a problem when attached.