A vapor chamber structure includes an upper metal casing, a lower metal casing, a partition plate and a working fluid. The lower metal casing is engaged and sealed with the upper metal casing, and a containing chamber is formed between the upper metal casing and the lower metal casing. The partition plate is laid inside the containing chamber and includes a gas channel configured to be facing the upper metal casing. The working fluid is filled in the containing chamber. Therefore, the gas evaporated in the vapor chamber will move along a fixed path to prevent the occurrence of turbulence effectively.