A synthetic resin bottle, wherein a bottom includes: an annular-shaped peripheral portion; a protruding ridge disposed radially inward from the peripheral portion and configured to serve as a ground contacting portion of the bottle by protruding downward from the peripheral portion and configured, when deformed under reduced pressure, to make the peripheral portion serve as the ground contacting portion by displaced toward an inside of the bottle (upward); and a depressed recess located radially inward from the protruding ridge and depressed toward the inside of the bottle. The peripheral portion has an outer diameter dimension less than that of a lower end portion of the trunk, or a plurality of radiately extending groove portions is arranged side by side at an equal interval in the circumferential direction in the peripheral portion.