Blow molding method, blow mold, and blow-molded container

A blow molding method comprising:

• a primary blow molding step that blow-molds a preform into an intermediate molded article in a primary blow mold, the primary blow mold including a primary temperature control section;
• a shrinkage step that discharges blow air from the intermediate molded article to shrink the intermediate molded article;
• and
• a secondary blow molding step that blow-molds the intermediate molded article into a final molded article in a secondary blow mold, the secondary blow mold including a secondary temperature control section,
• wherein the primary blow mold includes a first primary temperature control section and a second primary temperature control section that are defined by dividing the primary temperature control section in a vertical stretch direction,
• wherein the primary blow molding step cools a first intermediate molding region of the intermediate molded article that follows a neck using the first primary temperature control section, and
• wherein the shrinkage step shrinks a second intermediate molding region of the intermediate molded article, the temperature of the second intermediate molding region having been controlled by the second primary temperature control section.