32CAP NUTRITIONAL SUPPLEMENT CONTAINER USING THE SAME, AND NUTRITIONAL SUPPLEMENT SUPPLY SETABSTRACT5A cap 13 is to be secured to a mouth 12 of a container body 11 of a nutritionalsupplement container 10 and allows a liquid material filled in the container body 11 to flow out. The cap 13 includes the following: a cap body 22 a communicating member 19 that is coupled to the cap body 22 via a bridge 19a, can pierce a thin film 16 of themouth 12 by being pushed toward the container body 11 when the bridge 19a is10 broken or deformed, and allows the liquid material filled in the container body 11 to flow out of the nutritional supplement container 10 after the thin film 16 has been broken and a connection maintaining structure that can maintain a connection with a connector that is connected to the cap and thus can be communicated with the inside of the container body.15Figure 2