A fluid-collecting container for receiving a siphoned-off fluid has a closed chamber for a solidifying agent. The chamber can be opened towards an internal space in the fluid-collecting container under external application of force. At least part of the chamber projects into the internal space in the fluid-collecting container. On the outer side of the container, the chamber is closed by an outer wall which can be pressed inwards, and the chamber is open towards the internal space in the fluid-collecting container by the outer wall being pressed in. The internal space continues to be closed to the outside in the region by the outer wall. The fluid-collecting container has a first and a second housing part which together form the internal space in the fluid-collecting container. The outer wall is formed integrally with a wall of the first housing part, the wall surrounding the outer wall. The fluid-collecting container can be produced cost-effectively and prevents damage to the chamber containing the solidifying agent prior to the use thereof. Furthermore, the chamber can be opened in a simple and safe manner when required.