To provide an apparatus for heating a preform to be subjected to blow molding and a container which has been subjected to blow molding, a container which increases a drawing ratio in blow molding, especially, can increase a drawing magnitude in a diameter direction, therefore, has a body part having a larger diameter compared to a diameter of a mouth part.SOLUTION: A heater 32 is arranged on one side wall 31 while sandwiching a preform 2 to be heated, and a slim cooling air blowout slit 33 is provided in a vertical direction on the other side wall 34. The heater 32 is formed of a plurality of infrared heaters and other heater elements h (h1 to h13), and is arranged on a line in a vertical direction facing the slit 33 while sandwiching a shaft center of the preform 2 set at a fixed position. Heater elements h13, h12...

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