Tank manufacturing method and tank

A tank, comprising:

• a liner;
• a reinforcing layer formed of fiber reinforced resin that is arranged on the liner;
• a label arranged on the reinforcing layer;
• and
• a surface layer formed of glass fiber reinforced resin that is arranged to cover the label, the surface layer arranged on the reinforcing layer, wherein:
• the reinforcing layer comprises:
• an inner layer,
• an outer layer having a cover rate smaller than the inner layer and smaller than 100%, the cover rate being a percentage of a volume occupied by the fiber reinforced resin in space of the reinforcing layer, and the outer layer being arranged on the inner layer, and
• an outermost layer provided to arrange the shape of the reinforcing layer, the outermost layer having a cover rate larger than the outer layer, the outermost layer formed by hoop winding on the outer layer,
• at least a part of the label is embedded in the reinforcing layer,
• the outer layer comprises a helical layer formed by helical winding and a hoop layer formed by hoop winding,
• a surface of the label and a surface of a surrounding reinforcing layer positioned around the label in the reinforcing layer are positioned on a substantially same surface,
• a boundary portion between the surface of the label and the reinforcing layer forms a smooth face with any level difference, and
• the label is surrounded by the surface layer and the reinforcing layer, the surface layer covering the label along a top surface of the label, the reinforcing layer surrounding the label along both side surfaces of the label and a bottom surface of the label, the top surface of the label being in contact with the surface layer and not in contact with the reinforcing layer.