| 摘要 |
There is provided a synthetic resin bottle having high commercial value, which prevents plastic deformation accompanied with buckling. The invention provides a PET bottle 100 comprising a body portion 130 connected to a mouth portion 110 via a shoulder portion 120, and a constricted portion 150 provided on the body portion and looping along the circumferential direction. The body portion 130 comprises a front wall 130a and a back wall 130b which face to each other, a left sidewall 130c and a right sidewall 130d which face to each other, and connecting portion 130e which respectively join the walls 130a-130d. The cross section of the body portion 130 along the circumferential direction a generally polygonal outer profile. The constricted portion 150 comprises left lateral grooves 1a, 2a extending from the left sidewall 150c at least to the connecting portion 150e along the circumferential direction, right lateral grooves 1b, 2b extending from the right sidewall 150d at least to the connecting portion 150e along the circumferential direction and intermittent portions formed by spacing apart adjacent terminal ends 1ae, 1be and 2ae, 2be of the lateral grooves 1a, 1b and 2a, 2b.
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