Plug body and beverage container

A plug body comprising:

• a spout part;
• a pressure release valve arranged at a position different from an arrangement position of the spout part;
• and
• a shoulder member which has an opening projecting toward the spout part and fully covers a top surface of the pressure release valve,
• wherein the pressure release valve comprises a valve body, and a ring-shaped member is disposed between a bottom surface of the valve body and a lower containment wall part of a cylindrical wall part of the plug body,
• wherein the shoulder member comprises an inner shoulder member and an outer shoulder member, wherein a diameter of an opening of the inner shoulder member is larger than a diameter of an opening of the outer shoulder member,
• wherein the cylindrical wall part of the plug body further comprises an upper containment wall part and a lower sidewall part, and an opening is disposed between the upper containment wall part and the lower sidewall part for discharging vaporized gas therefrom,
• wherein the male threaded part is protruded from a lower portion to a middle portion of an outer peripheral surface of the lower sidewall part, wherein a notch is disposed at an upper portion of the lower sidewall part, and the opening is formed by arranging the upper containment wall part on an upper side of the notch.