Method for manufacturing resin container and blow molding method

A blow molding apparatus comprising:

• an injection molding unit configured to injection-mold a preform made of a resin and having a bottomed shape;
• a temperature adjusting unit configured to adjust a temperature of the preform manufactured by the injection molding unit;
• and
• a blow molding unit configured to blow-mold the preform adjusted in temperature to manufacture a resin container,
• wherein the temperature adjusting unit includes:
• a cavity mold that accommodates the preform;
• a refrigerant introduction member which includes a first flow path and a second flow path which are different in introduction or discharge position of a refrigerant respectively and to be inserted into the preform;
• a first switching unit configured to switch a flow direction of the refrigerant in the first flow path;
• and
• a second switching unit configured to switch the flow direction of the refrigerant in the second flow path;
• and
• wherein the first switching unit and the second switching unit switch 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.