Patent ID: 8505756

Claim:
A biaxially stretched, blow molded synthetic resin bottle with a bottom comprising: a bottom ridge disposed inward from peripheral foot and formed by projecting a portion of a bottom plate downward to a position lower than a level of the peripheral foot so that the bottom ridge performs a function as a ground contact portion, and a central concave portion formed by concaving the bottom plate upward and inward, starting from an edge of an inner sidewall of the bottom ridge, wherein the bottom plate ranging from the bottom ridge to the central concave portion performs a vacuum-absorbing function as the bottom plate in this range draws upward with progress of internal depressurization, wherein in this state, the peripheral foot instead of the bottom ridge is assigned to perform the function as the ground contact portion, and wherein the peripheral foot has a surface sloped obliquely upward in a central axial direction of the bottle and has a width in a range of 2 to 4 mm.