A steam generator for a cooker comprising: a heating chamber comprising a chamber body and a chamber cover coupled to the chamber body, the heating chamber having a heating space defined between the chamber body and the chamber cover, a water supply hole through which steam water is supplied into the heating space, and a steam discharge hole disposed above the water supply hole to discharge steam; at least one steam heater inserted into one of the chamber body and the chamber cover, the steam heater heating the steam water stored in the heating space to generate the steam; and an overflow prevention member disposed in at least one side of the chamber body and the chamber cover, the overflow prevention member preventing the steam water heated by the steam heater from boiling over the steam discharge hole, wherein the overflow prevention member partitions the heating space into a saturation region that is a portion of the heating space corresponding to a lower side of the overflow prevention member, and an overheating region that is a portion of the heating space corresponding to an upper side of the overflow prevention member, characterized in that the steam generator further comprises at least one interference member disposed in at least one side of the chamber body and the chamber cover, the interference member interfering with the discharge of the steam through the steam discharge hole, the interference member is disposed above the overflow prevention member and below the steam discharge hole, and the steam interfering with the discharge toward the steam discharge hole by the interference member is re-heated in the overheating region by the steam heater. a heating chamber comprising a chamber body and a chamber cover coupled to the chamber body, the heating chamber having a heating space defined between the chamber body and the chamber cover, a water supply hole through which steam water is supplied into the heating space, and a steam discharge hole disposed above the water supply hole to discharge steam; at least one steam heater inserted into one of the chamber body and the chamber cover, the steam heater heating the steam water stored in the heating space to generate the steam; and an overflow prevention member disposed in at least one side of the chamber body and the chamber cover, the overflow prevention member preventing the steam water heated by the steam heater from boiling over the steam discharge hole, wherein the overflow prevention member partitions the heating space into a saturation region that is a portion of the heating space corresponding to a lower side of the overflow prevention member, and an overheating region that is a portion of the heating space corresponding to an upper side of the overflow prevention member, characterized in that the steam generator further comprises at least one interference member disposed in at least one side of the chamber body and the chamber cover, the interference member interfering with the discharge of the steam through the steam discharge hole, the interference member is disposed above the overflow prevention member and below the steam discharge hole, and the steam interfering with the discharge toward the steam discharge hole by the interference member is re-heated in the overheating region by the steam heater.