A bottle made from synthetic resin material and formed by blow-molding in a cylindrical shape having a bottom, the bottle comprising: a bottom portion including: a heel portion having an upper opening portion which is connected to a lower opening section of a body portion, and a bottom wall portion having a circumferential edge configuring a grounding portion, the bottom wall portion closing a lower opening section of the heel portion, wherein the bottom wall portion includes, a rising circumferential wall portion continuing into the ground portion from an inside in a radial direction of the bottle and extending upward; a movable wall portion having an annular shape and protruding toward the inside in the radial direction of the bottle from an upper end portion of the rising circumferential wall portion; and a recessed circumferential wall portion extending upward from an inner edge portion of the movable wall portion in the radial direction of the bottle; and the movable wall portion being rotatably provided having a connection part with the rising circumferential wall portion as a center so as to move the recessed circumferential wall portion upward, wherein the heel portion includes a lower heel edge portion continuing into the grounding portion, an upper heel portion connected to the body portion, and a connection part connecting the lower heel edge portion and the upper heel portion, wherein the connection part is gradually reduced in diameter from an upper side toward a lower side thereof, characterised in that: the upper heel portion has the same outer diameter throughout a length direction of the bottle; the lower heel edge portion has the same outer diameter throughout the length direction of the bottle and is formed in a smaller diameter than the upper heel portion. a bottom portion including: a heel portion having an upper opening portion which is connected to a lower opening section of a body portion, and a bottom wall portion having a circumferential edge configuring a grounding portion, the bottom wall portion closing a lower opening section of the heel portion, wherein a heel portion having an upper opening portion which is connected to a lower opening section of a body portion, and a bottom wall portion having a circumferential edge configuring a grounding portion, the bottom wall portion closing a lower opening section of the heel portion, wherein the bottom wall portion includes, a rising circumferential wall portion continuing into the ground portion from an inside in a radial direction of the bottle and extending upward; a movable wall portion having an annular shape and protruding toward the inside in the radial direction of the bottle from an upper end portion of the rising circumferential wall portion; and a recessed circumferential wall portion extending upward from an inner edge portion of the movable wall portion in the radial direction of the bottle; and the movable wall portion being rotatably provided having a connection part with the rising circumferential wall portion as a center so as to move the recessed circumferential wall portion upward, wherein the heel portion includes a lower heel edge portion continuing into the grounding portion, an upper heel portion connected to the body portion, and a connection part connecting the lower heel edge portion and the upper heel portion, wherein the connection part is gradually reduced in diameter from an upper side toward a lower side thereof, characterised in that: the upper heel portion has the same outer diameter throughout a length direction of the bottle; the lower heel edge portion has the same outer diameter throughout the length direction of the bottle and is formed in a smaller diameter than the upper heel portion. the upper heel portion has the same outer diameter throughout a length direction of the bottle; the lower heel edge portion has the same outer diameter throughout the length direction of the bottle and is formed in a smaller diameter than the upper heel portion.