A method for manufacturing a resin container, comprising: injection-molding a preform made of a resin and having a bottomed shape; adjusting a temperature of the preform manufactured in the injection molding; and blow-molding the preform adjusted in temperature to manufacture a resin container, wherein, in the adjusting the temperature of the preform, the preform is accommodated in a cavity mold, and a refrigerant introduction member is inserted into the preform, characterized in that: in the adjusting the temperature of the preform, the preform is cooled by bringing the preform into close contact with an inner wall of the cavity mold at a pressure of the refrigerant introduced from the refrigerant introduction member; the refrigerant introduction member includes a first flow path and a second flow path which are different in introduction or discharge position of a refrigerant respectively; and when the preform is cooled, cooling is performed by switching between a first cooling blow for introducing the refrigerant from the first flow path and discharging the refrigerant from the second flow path and a second cooling blow for introducing the refrigerant from the second flow path and discharging the refrigerant from the first flow path. injection-molding a preform made of a resin and having a bottomed shape; adjusting a temperature of the preform manufactured in the injection molding; and blow-molding the preform adjusted in temperature to manufacture a resin container, wherein, in the adjusting the temperature of the preform, the preform is accommodated in a cavity mold, and a refrigerant introduction member is inserted into the preform, characterized in that: in the adjusting the temperature of the preform, the preform is cooled by bringing the preform into close contact with an inner wall of the cavity mold at a pressure of the refrigerant introduced from the refrigerant introduction member; the refrigerant introduction member includes a first flow path and a second flow path which are different in introduction or discharge position of a refrigerant respectively; and when the preform is cooled, cooling is performed by switching between a first cooling blow for introducing the refrigerant from the first flow path and discharging the refrigerant from the second flow path and a second cooling blow for introducing the refrigerant from the second flow path and discharging the refrigerant from the first flow path. in the adjusting the temperature of the preform, the preform is cooled by bringing the preform into close contact with an inner wall of the cavity mold at a pressure of the refrigerant introduced from the refrigerant introduction member; the refrigerant introduction member includes a first flow path and a second flow path which are different in introduction or discharge position of a refrigerant respectively; and when the preform is cooled, cooling is performed by switching between a first cooling blow for introducing the refrigerant from the first flow path and discharging the refrigerant from the second flow path and a second cooling blow for introducing the refrigerant from the second flow path and discharging the refrigerant from the first flow path.