A bottle of the invention includes a bottom wall portion (19) of a bottom portion (14) that includes a grounding portion (18) located at an outer circumferential edge, a rising circumferential wall portion (21) that is continuous with the grounding portion (18) from a radial inner side of the bottle, and a movable wall portion (22) that protrudes from an upper end of the rising circumferential wall portion (21). The movable wall portion (22) is disposed to be movable upward around a connected portion (25) to the rising circumferential wall portion (21). A plurality of ribs (26) are radially disposed around a bottle axis (O) on the movable wall portion (22), and the ribs (26) include a main recess (26a) that is recessed upward, and a connection recess (26b). A plurality of the main recesses (26a) are arranged at predetermined intervals in the radial direction of the bottle, and the connection recess (26b) connects main recesses (26a), which are adjacent to each other in the radial direction of the bottle, in the radial direction of the bottle together. A depth ratio D2/D1 that is the ratio of a depth (D2) of the connection recess (26b) to a depth (D1) of each main recess (26a) is greater than 2/9 and equal to or smaller than 1.