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|1. (WO2018159128) STRUCTURE|
CHICHIBU CHEMICAL CO., LTD.
[Solution] A substantially flat structure comprising a central portion formed by connecting a plurality of first pieces, and a frame portion formed by connecting a plurality of second pieces, wherein the first piece comprises a first front surface portion having a plurality of first openings, and first leg portions provided in locations sandwiching a first passage formed on the side, and the second piece comprises a second front surface portion having at least one second opening, and second leg portions provided in locations sandwiching a second passage formed on the side. The opening percentage, which is the ratio of the area of the first opening with respect to the area of the first surface portion, is 18% or greater and the porosity, which is the ratio of the volume of the space including the first opening, the second opening, the first passage, and the second passage with respect to the volume of the substantially flat structure, is 80% or greater.