| 摘要 |
<p>A bottle is formed of a synthetic resin material in a cylindrical shape with a bottom, and a bottom wall portion of a bottom portion thereof includes a grounding portion located at an outer circumferential edge, a rising circumferential wall portion that is connected from a bottle radial inner side to the grounding portion and extends upward, an annular movable wall portion protruding from an upper end of the rising circumferential wall portion toward the bottle radial inner side, and a recessed circumferential wall portion that is connected from the bottle radial inner side to the movable wall portion and extends upward. The movable wall portion is disposed to be free to rotate around a portion connected to the rising circumferential wall portion so as to move the recessed circumferential wall portion in an upward direction. The rising circumferential wall portion extends so as to be gradually inclined toward the bottle radial inner side with the approach from the grounding portion toward the portion connected to the movable wall portion, and an inclined angle thereof is equal to or less than 10° with respect to a bottle axis.</p> |
