Abstract: A preform assembly includes: an outer preform that includes an outer mouth portion and a stretch portion connected to the outer mouth portion and in which a recess extending in a vertical direction is provided on an inner surface of the stretch portion; and an inner preform that includes an inner mouth portion and a stretch portion connected to the inner mouth portion, wherein an outside air introduction port communicating with a part between the outer preform and the inner preform is provided in a mouth portion composed of the outer mouth portion and the inner mouth portion located on an inner side of the outer mouth portion.

Abstract: A preform assembly includes: an outer preform that includes an outer mouth portion and a stretch portion connected to the outer mouth portion and in which a recess extending in a vertical direction is provided on an inner surface of the stretch portion; and an inner preform that includes an inner mouth portion and a stretch portion connected to the inner mouth portion, wherein an outside air introduction port communicating with a part between the outer preform and the inner preform is provided in a mouth portion composed of the outer mouth portion and the inner mouth portion located on an inner side of the outer mouth portion.

Abstract: The present invention is a bottle with a handle which includes a bottle in which a mouth portion, a shoulder portion, a body portion, and a bottom portion are configured continuously in this order from top to bottom; and a handle. The body portion is provided with a mounting recess which is recessed forward and opened rearward, in a radial direction. The handle is mounted to the mounting recess. An upper peripheral groove extending continuously over an entire length in a circumferential direction is formed in a connecting portion between the shoulder portion and the body portion. A portion of the upper peripheral groove which is located at the same position in the circumferential direction as at least a part of the mounting recess is a shallow groove portion having a groove depth shallower than other portion.

Abstract: A preform assembly includes: an outer preform that includes an outer mouth portion and a stretch portion connected to the outer mouth portion and in which a recess extending in a vertical direction is provided on an inner surface of the stretch portion; and an inner preform that includes an inner mouth portion and a stretch portion connected to the inner mouth portion, wherein an outside air introduction port communicating with a part between the outer preform and the inner preform is provided in a mouth portion composed of the outer mouth portion and the inner mouth portion located on an inner side of the outer mouth portion.