Blow mold unit and blow molding device using same

A blow mold unit, comprising;

• a blow cavity mold including a pair of split molds to be mold-clamped upon contact of parting surfaces thereof with each other, and forming a molding space for molding a hollow container having a push-up bottom;
• a bottom mold for forming a bottom surface of the molding space;
• a fixing member having an upper surface side to which the bottom mold is fixed, and a lower surface side to which an elevation rod provided in a raising/lowering device is connected;
• and
• a key member coupling the elevation rod and the fixing member together,
• wherein an insertion hole for inserting the elevation, rod is formed to open, on the lower surface side of the fixing member, and a communication hole communicating with the insertion hole is formed to open at a side surface of the fixing member, and
• the key member is inserted into the communication hole and engaged with a key groove provided at a distal end of the elevation rod, whereby the elevation rod and the fixing member are coupled together.