To provide an outer package with high insulating effect which can reduce conduction of heat between a container and the outer package to the outside of the outer package or the inside of the container with the passage of time.

The outer package fixed to the side face of the container having at least a side wall, a bottom, and an opening, includes a tubular outer package body and a heat emission part which is provided at the bottom side by a predetermined distance from the edge of the opening side of the outer package body so as to penetrate the outer package body from the side face of the container to the outside. The outer package can demonstrate higher insulating effect than conventional outer packages since it has the heat emission part.