A method for manufacturing a container made of resin, the method comprising: an injection molding step of injection molding a bottomed preform made of resin in an injection cavity mold; a temperature adjustment step of adjusting a temperature of the preform manufactured in the injection molding step; and a blow molding step of blow molding the preform whose temperature has been adjusted to manufacture the container made of resin, wherein in the temperature adjustment step, the preform is accommodated in a cavity mold, an air introduction member is brought into airtight contact with the preform, and air is supplied from a blowing port of the air introduction member into the preform and the air is discharged from a discharge port of the air introduction member to an outside of the preform, so that the preform is in close contact with an inner wall of the cavity mold and is cooled wherein a temperature adjusting medium flows in the cavity mold, wherein, in the temperature adjustment step, the preform is temperature-adjusted from an outer side by the close contact with the cavity mold, wherein the preform is cooled from an inner side by convection of the air from the air introduction member, wherein the air introduction member includes a hollow rod member having an air flowing hole formed therein and a fitting core, wherein when the air introduction member is inserted into the preform, the fitting core is fitted with a neck part of the preform, thereby preventing the air in the preform from being leaked from the neck part to an outside of the fitting core, and, wherein a gap between the rod member and the fitting core is an air flowing path for supplying and discharging the air with respect to the preform. an injection molding step of injection molding a bottomed preform made of resin in an injection cavity mold; a temperature adjustment step of adjusting a temperature of the preform manufactured in the injection molding step; and a blow molding step of blow molding the preform whose temperature has been adjusted to manufacture the container made of resin, wherein in the temperature adjustment step, the preform is accommodated in a cavity mold, an air introduction member is brought into airtight contact with the preform, and air is supplied from a blowing port of the air introduction member into the preform and the air is discharged from a discharge port of the air introduction member to an outside of the preform, so that the preform is in close contact with an inner wall of the cavity mold and is cooled the preform is accommodated in a cavity mold, an air introduction member is brought into airtight contact with the preform, and air is supplied from a blowing port of the air introduction member into the preform and the air is discharged from a discharge port of the air introduction member to an outside of the preform, so that the preform is in close contact with an inner wall of the cavity mold and is cooled wherein a temperature adjusting medium flows in the cavity mold, wherein, in the temperature adjustment step, the preform is temperature-adjusted from an outer side by the close contact with the cavity mold, wherein the preform is cooled from an inner side by convection of the air from the air introduction member, wherein the air introduction member includes a hollow rod member having an air flowing hole formed therein and a fitting core, wherein when the air introduction member is inserted into the preform, the fitting core is fitted with a neck part of the preform, thereby preventing the air in the preform from being leaked from the neck part to an outside of the fitting core, and, wherein a gap between the rod member and the fitting core is an air flowing path for supplying and discharging the air with respect to the preform.