A refrigerator, comprising: a freezer space defining a storage space; and a deep-freezing portion disposed in the freezer space and defining a deep-freeze space that is partitioned from the storage space thereof; a thermoelectric element module comprising a thermoelectric module having a heat absorbing surface and a heating surface and configured to generate cold air introduced into the deep-freezing portion; a fan facing the heat absorbing surface of the thermoelectric module and configured to introduce the cold air into the deep-freezing portion; and an accommodator accommodating the fan and protruding from an inner surface of the freezer space, wherein the deep-freezing portion comprises: a housing having an opening at a front surface thereof and an opening at a rear surface thereof to receive the accommodator, and defining an inner space of the deep-freezing portion; a door configured to open and close the front surface of the housing; and wherein the accommodator comprises a guide disposed at one side of the accommodator and configured to guide flow of the cold air, wherein the housing comprises a flow path defined at a portion of an inner surface of the housing and allowing to flow cold air introduced into the deep-freezing portion by the fan, and wherein the flow path has a step at the inner surface of the housing; characterized in that a width of the flow path is decreased along the longitudinal direction of the deep-freezing portion or is maintained constantly in a certain section along the longitudinal direction of the deep-freezing portion and then is decreased. a freezer space defining a storage space; and a deep-freezing portion disposed in the freezer space and defining a deep-freeze space that is partitioned from the storage space thereof; a thermoelectric element module comprising a thermoelectric module having a heat absorbing surface and a heating surface and configured to generate cold air introduced into the deep-freezing portion; a fan facing the heat absorbing surface of the thermoelectric module and configured to introduce the cold air into the deep-freezing portion; and an accommodator accommodating the fan and protruding from an inner surface of the freezer space, wherein the deep-freezing portion comprises: a housing having an opening at a front surface thereof and an opening at a rear surface thereof to receive the accommodator, and defining an inner space of the deep-freezing portion; a door configured to open and close the front surface of the housing; and wherein the accommodator comprises a guide disposed at one side of the accommodator and configured to guide flow of the cold air, wherein the housing comprises a flow path defined at a portion of an inner surface of the housing and allowing to flow cold air introduced into the deep-freezing portion by the fan, and wherein the flow path has a step at the inner surface of the housing; characterized in that a width of the flow path is decreased along the longitudinal direction of the deep-freezing portion or is maintained constantly in a certain section along the longitudinal direction of the deep-freezing portion and then is decreased. a housing having an opening at a front surface thereof and an opening at a rear surface thereof to receive the accommodator, and defining an inner space of the deep-freezing portion; a door configured to open and close the front surface of the housing; and wherein the accommodator comprises a guide disposed at one side of the accommodator and configured to guide flow of the cold air, wherein the housing comprises a flow path defined at a portion of an inner surface of the housing and allowing to flow cold air introduced into the deep-freezing portion by the fan, and wherein the flow path has a step at the inner surface of the housing; characterized in that a width of the flow path is decreased along the longitudinal direction of the deep-freezing portion or is maintained constantly in a certain section along the longitudinal direction of the deep-freezing portion and then is decreased.