Synthetic resin bottle

A synthetic resin bottle comprising:

• a mouth from which a content medium is to be dispensed, a shoulder, a trunk, and a bottom, all of which are integrally formed in the stated order,
• the bottom being configured to be displaced toward an inside direction of the synthetic resin bottle under a reduced pressure generated in an inside of the synthetic resin bottle, the bottom including:
• an annular-shaped peripheral portion;
• a protruding ridge disposed radially inward from the peripheral portion and protruding further away from the inside of the synthetic resin bottle than the peripheral portion such that the protruding ridge contacts a surface without having the peripheral portion contact the surface when the synthetic resin bottle is placed on the surface, the protruding ridge being configured to recede toward the inside of the synthetic resin bottle such that the peripheral portion contacts the surface without having the protruding ridge contact the surface when the reduced pressure is generated inside of the synthetic resin bottle and the synthetic resin bottle is placed on the surface;
• a depressed recess located radially inward from the protruding ridge and depressed toward the inside of the synthetic resin bottle;
• and
• a plurality of radiately extending groove portions are arranged side by side at an equal interval in a circumferential direction in the peripheral portion.