PURPOSE: A reinforcing structure of a liquefied-natural-gas cargo hole is provided to increase the rigidity to endure heat load and shock by preventing gas from flowing in a specific direction by inserting a filler material of a cross shape into the intersection part of wrinkle part. CONSTITUTION: A reinforcing structure of a liquefied-natural-gas cargo hole comprises a membrane(160), and a filler material(170). The membrane forms a liquefied-natural-gas cargo hole. The filler material is inserted into the membrane. A first wrinkle part(162) and a second wrinkle part(164) intersect on the filler material. The filler material is fixed by forcibly inserting the central part of a cross shape to an intersection part. The filler material is fixed to the inner side of the membrane using an attachment unit. A double sided tape is used for the attachment unit.
