Problem to be solved. To provide a plastic bottle having an inner capacity of 2L, which can be reduced in weight without greatly changing a bottle size and which has a sufficient strength. Solution. This plastic bottle comprises: a mouth; a shoulder continuous from the mouth; a trunk continuous from the shoulder; and a bottom continuous from the trunk. A sectional shape along the peripheral direction of the trunk is a square having round corners. The maximum peripheral length LMAX of the trunk, the mass M of the plastic bottle, and the full capacity CMAX of the plastic bottle have relationships represented by the following expressions (1) and (2). LMAX/CMAX≤0.162 (mm/mL) (1) and CMAX/M≥52 (mL/g) (2).

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