Abstract: A gas cooking stove is disclosed to which a very-small gas cylinder is joined in a one-touch manner and the state of joining is reliably maintained. When the gas cooking stove is used, the gas cooking stove can stably be installed. When the gas cooking stove is not used, the overall size can be reduced to save the space. Thus, the operability, safety and the portability can be improved. A valve mechanism, an operation member for opening/closing the valve mechanism and a piezoelectric spark unit are provided. Moreover, a stove body is provided which has an upper portion to which a dish is joined and a lower portion provided with a gas-cylinder joining portion to which a gas cylinder is joined. A grate is rotatively supported by the dish.