To provide a plastic container in which a bottom cup is not off a container main body even when unexpected external force in the peripheral direction is acted thereon.

This plastic container whose horizontal cross sectional shape is oval is provided with a container main body 100, a lid material 220 which is positioned and screwed and a bottom cup 300 which has design windows. A stepped height is provided at the lower part of a shell part of the container main body, and a bottom cup fitting part 130 whose lower part becomes narrow is formed therein. A plurality of fitting parts 131 for fitting the bottom cup at the peripheral wall upper position of the bottom cup fitting part in the lower vicinity position of the stepped height are provided so as to oppose, and at least more than one fitting part 132 for rotation-stopping the bottom cup are provided at the peripheral wall lower position of the bottom cup fitting part, and fitting parts 311 and 312 corresponding to the fitting part for fitting and rotation-stopping the bottom cup of the bottom cup fitting part of the container main body are provided on the inner peripheral wall of the bottom cup.