Tank and method of manufacturing the same

A tank comprising:

• a tank body part, an inside of the tank body part being able to be filled with a gas, the tank body part comprising a liner having a hollow cylindrical shape, and a fiber bundle layer covering an outer surface of the liner, wherein
• the fiber bundle layer has an inner layer, an outer layer, and an intermediate layer disposed between the inner layer and the outer layer,
• an end portion of the intermediate layer is located on an inner side than an end portion of the fiber bundle layer in an axial direction of the tank;
• and
• a mouthpiece disposed at an outer circumference of a smaller diameter end portion of the tank body part, wherein
• the end portion of the intermediate layer is located on an inner side than the mouthpiece in the axial direction
• wherein the inner layer is an innermost layer of the fiber bundle layer, which directly covers the entire outer surface of the liner;
• the smaller diameter end portion of the tank body part comprises a liner small diameter end and a fiber bundle layer small diameter end portion, and the fiber bundle layer small diameter end portion comprises the inner layer and the outer layer;
• and
• the liner includes an insert ring proximate the liner small diameter end, and the end of the intermediate layer is disposed in an area overlapping with the insert ring.