A cooking device including a water supply device, wherein the water supply device comprises: a housing that is installed in a main body of the cooking device and defines an accommodating space, and one side in a forward and rearward direction is provided to be opened to an outside of the main body; and a water tank that defines a storage space to store water and has an inlet to define a passage to introduce water into the storage space, and is installed in the housing so that a position of the water tank is changed to an insertion position in which the inlet is placed in the accommodating space and a withdrawal position in which the inlet is exposed to an outside of the accommodating space; the water supply device further comprises: a connector that is installed in the housing to be movable forward and rearward in the accommodating space and moves forward and rearward to change the position of the water tank to the insertion position or the withdrawal position, characterized in that the connector comprises a rear frame that faces a rear surface of the water tank and a pair of side frames that extends from both ends of the rear frame and faces a side of the water tank, wherein the water tank is coupled to the connector so that a movement of the water tank is performed together with a movement of the connector, and the water tank is coupled to the connector in a manner in which the rear frame and the pair of side frames surround the rear surface and both sides of the water tank, and wherein an entire connector is placed inside of the accommodating space when the position of the water tank is the insertion position, the water supply device further comprising a power generator that is adapted to provide power to move the water tank adjacent to the withdrawal position, and wherein the power generator comprises an elastic member one side of which is coupled to the housing and the other side of which is coupled to the connector, and that, when the connector moves rearward, a distance between one side and the other side of the elastic member is increased to generate an elastic force in a direction of moving the connector forward. a housing that is installed in a main body of the cooking device and defines an accommodating space, and one side in a forward and rearward direction is provided to be opened to an outside of the main body; and a water tank that defines a storage space to store water and has an inlet to define a passage to introduce water into the storage space, and is installed in the housing so that a position of the water tank is changed to an insertion position in which the inlet is placed in the accommodating space and a withdrawal position in which the inlet is exposed to an outside of the accommodating space; the water supply device further comprises: a connector that is installed in the housing to be movable forward and rearward in the accommodating space and moves forward and rearward to change the position of the water tank to the insertion position or the withdrawal position, characterized in that the connector comprises a rear frame that faces a rear surface of the water tank and a pair of side frames that extends from both ends of the rear frame and faces a side of the water tank, wherein the water tank is coupled to the connector so that a movement of the water tank is performed together with a movement of the connector, and the water tank is coupled to the connector in a manner in which the rear frame and the pair of side frames surround the rear surface and both sides of the water tank, and wherein an entire connector is placed inside of the accommodating space when the position of the water tank is the insertion position, the water supply device further comprising a power generator that is adapted to provide power to move the water tank adjacent to the withdrawal position, and wherein the power generator comprises an elastic member one side of which is coupled to the housing and the other side of which is coupled to the connector, and that, when the connector moves rearward, a distance between one side and the other side of the elastic member is increased to generate an elastic force in a direction of moving the connector forward. a connector that is installed in the housing to be movable forward and rearward in the accommodating space and moves forward and rearward to change the position of the water tank to the insertion position or the withdrawal position, characterized in that the connector comprises a rear frame that faces a rear surface of the water tank and a pair of side frames that extends from both ends of the rear frame and faces a side of the water tank, wherein the water tank is coupled to the connector so that a movement of the water tank is performed together with a movement of the connector, and the water tank is coupled to the connector in a manner in which the rear frame and the pair of side frames surround the rear surface and both sides of the water tank, and wherein an entire connector is placed inside of the accommodating space when the position of the water tank is the insertion position, the water supply device further comprising a power generator that is adapted to provide power to move the water tank adjacent to the withdrawal position, and wherein the power generator comprises an elastic member one side of which is coupled to the housing and the other side of which is coupled to the connector, and that, when the connector moves rearward, a distance between one side and the other side of the elastic member is increased to generate an elastic force in a direction of moving the connector forward.