The bottle preform and

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PROBLEM TO BE SOLVED : To provide a preform capable of preventing a phenomenon (stack phenomenon) such that a cylindrical part of a preform is inserted into a mouth part of another preform and becomes unable to be easily pulled out, and to provide a plastic bottle.SOLUTION : A preform 10 includes a mouth part 11, a cylindrical part 20, and a bottom part 30. The cylindrical part 20 has a large diameter part 21, a small diameter part 23, and an inclined part 22 whose diameter is reduced toward the small diameter part 23 side from the large diameter part 21 side. When the inner diameter of the mouth part 11 is defined as Dand the outer diameter of the small diameter part 23 of the cylindrical part 20 is defined as D, a relation of D

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