A cooker is mounted on a combustion type heating device used as a heat source for the cooker, and has a combustion gas distribution chamber formed in the space between double walls of a dish-shaped cooker base and a combustion gas distribution unit that are sequentially stacked from a lower, and a cooking chamber formed above the combustion gas distribution chamber by stacking the combustion gas distribution unit or the cooker base and a cooking chamber cover unit. Combustion gas communication ports between the combustion gas distribution chamber and the cooking chamber and combustion gas outlet ports between the cooking chamber and an outer surface of the cooker are arranged alternately with each other along a bottom edge of the cooking chamber, such that the flow of the combustion gas which has passed through the combustion gas communication ports and introduced into the cooking chamber and the flow of air being discharged from the cooking chamber to the outside of the cooking chamber may not collide against each other and a smooth flow of air may be achieved. The center of the cooking chamber may be fully used as a cooking space, and both direct heating type cooking and indirect heating type cooking are possible.