A refrigerator, wherein the refrigerator comprises: a cooler of a freezing loop, the cooler being configured to cool air supplied via an air supply passageway to a storage chamber ; a cooling chamber equipped with the cooler and formed with an air supply port communicated with the storage chamber ; a blower fan configured to feed the air supplied through the air supply port to the storage chamber ; a shielding device at least partially blocking the air supply port ; and a control device configured to control acts of the freezing loop, the blower fan and the shielding device , the shielding device comprises: a fan cover configured to cover the blower fan from the outside of the cooling chamber ; a drive shaft configured to drive the fan cover to open and close; a screw mechanism formed between the drive shaft and the fan cover ; and an electric motor configured to rotate the drive shaft , the control device causes the fan cover to approach the blower fan by rotating the drive shaft in one direction, to perform a closing action to close the air passageway, the control device moves the fan cover away from the blower fan by rotating the drive shaft in another direction, to perform an opening action of opening the air passageway, the control device performs a silent action during a termination period of the closing action or the opening action, the silent action reducing the action sound caused by the action of the electric motor , wherein during a cooling operation, the control device makes the rotation speed of the electric motor become a low speed during the termination period of the closing action or the opening action, to achieve the silent action, upon performing the initial action, the control device makes the electric motor rotate intermittently during the termination period of the closing action or the opening action to achieve the silent action. a cooler of a freezing loop, the cooler being configured to cool air supplied via an air supply passageway to a storage chamber ; a cooling chamber equipped with the cooler and formed with an air supply port communicated with the storage chamber ; a blower fan configured to feed the air supplied through the air supply port to the storage chamber ; a shielding device at least partially blocking the air supply port ; and a control device configured to control acts of the freezing loop, the blower fan and the shielding device , the shielding device comprises: a fan cover configured to cover the blower fan from the outside of the cooling chamber ; a drive shaft configured to drive the fan cover to open and close; a screw mechanism formed between the drive shaft and the fan cover ; and an electric motor configured to rotate the drive shaft , the control device causes the fan cover to approach the blower fan by rotating the drive shaft in one direction, to perform a closing action to close the air passageway, the control device moves the fan cover away from the blower fan by rotating the drive shaft in another direction, to perform an opening action of opening the air passageway, the control device performs a silent action during a termination period of the closing action or the opening action, the silent action reducing the action sound caused by the action of the electric motor , wherein during a cooling operation, the control device makes the rotation speed of the electric motor become a low speed during the termination period of the closing action or the opening action, to achieve the silent action, upon performing the initial action, the control device makes the electric motor rotate intermittently during the termination period of the closing action or the opening action to achieve the silent action. <EOS>