| 摘要 |
A bottle (1) made from synthetic resin material and formed by blow-molding in a cylindrical shape having a bottom, the bottle (1) including a bottom portion (14) including a heel portion (17) having an upper opening portion which is connected to a lower opening section of a body portion (13), and a bottom wall portion (19) having a circumferential edge configuring a grounding portion (18), the bottom wall portion (19) closing a lower opening section of the heel portion (17), wherein the bottom wall portion (19) includes a rising circumferential wall portion (21) continuing into the ground portion from an inside in a radial direction of the bottle (1) and extending upward, a movable wall portion (22) having an annular shape and protruding toward the inside in the radial direction of the bottle (1) from an upper end portion of the rising circumferential wall portion (21), and a recessed circumferential wall portion (23) extending upward from an inner edge portion of the movable wall portion (22) in the radial direction of the bottle (1). The movable wall portion (22) is freely rotatably provided having a connected portion (25) with the rising circumferential wall portion (21) as a center so as to move the recessed circumferential wall portion (23) upward. A lower heel edge portion (27) continuing into the grounding portion (18) is formed in a smaller diameter than an upper heel portion (28) continuing into the lower heel edge portion (27) from an upper side. |
