Bottle container

A bottle container comprising:

• a container body comprising (i) a cylindrical neck with an opening at its top and having a male thread formed therearound, (ii) a large-width fluid storage section having a width larger than the cylindrical neck, and (iii) a shoulder that connects the neck to the fluid storage section, said shoulder having a step in a radial direction on its outer surface;
• a shoulder part comprising (i) a cylindrical piece having a male thread on its outer periphery and a female thread on its inner periphery and having a pouring outlet with a sealed tip, and (ii) a widening section continuing from the cylindrical piece and having a projection-like member provided on its bottom face for engaging with the step on the shoulder of the container body, wherein the female thread of the cylindrical piece and the male thread of the cylindrical neck are engaged;
• a cap having an unsealing member for opening the seal tip at the pouring outlet, and a female thread for engaging with the male thread of the cylindrical piece;
• and
• a unsealing prevention member which is a plate-shaped cylinder with an opening formed at its center through which the shoulder part is inserted to interpose the unsealing prevention member between the cap and the shoulder part when the pouring outlet is not unsealed, where the unsealing prevention member has a thickness sufficient to allow the unsealing prevention member to function as a spacer to prevent the unsealing member of the cap from contacting the sealing tip of the pouring outlet.