Synthetic resin bottle

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.