To provide a carbonated water producing container which can easily and safely obtain carbonated water.

A carbonated water producing container 1 comprises: a liquid storage part 10 which stores water W and is formed with a pressure reducing hole 10a for releasing inner pressure to the other end side; a chemical holding part 20 which has a chemical storage chamber 211 detachably engaged with the liquid storage part 10 at one end side of the liquid storage part 10 to be pressure-tightly fitted to the liquid storage part 10 and storing a chemical S; and a pressure control part 30 which has a pressure control valve 32 fitted to the liquid storage part 10 at the other end side of the liquid storage part 10 to close the pressure reducing hole 10a and opening the pressure reducing hole 10a to reduce the inner pressure of the liquid storage part 10 when the inner pressure exceeds a predetermined value. The one end side of the liquid storage part 10 storing the water W is arranged upward, and then the one end side of the liquid storage part 10 is reversed downward in a state where the chemical S is stored in the chemical holding part 20, whereby the chemical S is dissolved in the water W to produce carbonated water by reaction of the chemical W.