Tank and manufacturing method for tank

A tank comprising:

• a structural body constituted by a liner and a fiber reinforced resin layer formed on an outer periphery of the liner, the structural body including a cylindrical portion and dome portions provided in opposite ends of the cylindrical portion in an axial direction of the cylindrical portion;
• and
• a heat insulating layer placed on an outer side of the structural body, the heat insulating layer being formed by use of a heat insulating sheet, wherein the heat insulating sheet includes
• dome forming portions covering the dome portions, the dome forming portions having notches, and
• an intermediate portion provided as a region between the dome forming portions such that the intermediate portion is wound around the cylindrical portion of the structural body in a circumferential direction of the cylindrical portion.