Bottle

A bottle formed of a synthetic resin material in a bottomed cylindrical shape, the bottle comprising:

• a bottom portion which includes a bottom wall portion with a grounding portion located at an outer circumferential edge thereof, and a tubular heel portion extending upward starting at an outer circumferential edge of the grounding portion, the grounding portion being only a lowermost portion of the bottom portion, wherein:
• the bottom wall portion includes the grounding portion, an inner circumferential wall portion extending upward starting at an inner circumferential edge of the grounding portion, and a recessed wall portion extending inward in a radial direction from an upper end of the inner circumferential wall portion,
• a plurality of concave portions is formed on the inner circumferential wall portion over the entire circumference of the inner circumferential wall portion, and
• the plurality of concave portions is located at a portion in the inner circumferential wall portion including at least a lower end edge of the inner circumferential wall portion,
• the plurality of concave portions is continuously formed on both the grounding portion and the inner circumferential wall portion,
• a lower portion of the inner circumferential wall portion is formed in a curved surface shape protruding inward in the radial direction, the lower portion of the inner circumferential wall portion extending upward starting at the inner circumferential edge of the grounding portion, and
• each of the plurality of concave portions is formed over an inner circumferential edge portion of the grounding portion and the lower portion of the inner circumferential wall portion, each of the plurality of concave portions begins extending inward in the radial direction at the inner circumferential edge portion of the grounding perter-portion, and
• the plurality of concave portions are located entirely below an upper end of the inner circumferential wall portion.