To provide a container for performing two-liquid mixing at the time of opening, capable of mixing two liquids by simple work without leaking a chemical liquid and having a simple structure.

The container for performing two-liquid mixing at the time of opening is constituted of a first container main body made of a synthetic resin, equipped with a cap which has a locking means provided to the outer wall thereof and is provided with a liquid dripping port sealed in a breakable manner and allowing a liquid to flow out and housing a first solution; an intermediate cylindrical member having a first protruded part which has locking means provided to both ends thereof and of which one end is locked with the cap to spirally advance to break the liquid dripping port of the first container main body to form a liquid passage, and which has a liquid passage piercing the central part thereof from the leading thereof; and a second container made of a synthetic resin having the opening end locked with the locking means of the other end part of the intermediate cylindrical member, and having the thin-walled breaking part coming into contact with the second protruded part and closed in a pressure breakable manner provided to the inner surface of the opening end part thereof and housing a second solution.