To provide a bottle-shaped container made of synthetic resin having annular lateral grooves on a container barrel, which can improve decompression absorbing performance without degrading buckling strength against vertical load to prevent the container from irregularly deforming and transforming.

The container made of synthetic resin 1 includes a mouth 2, the barrel 3 and a bottom 4. The barrel 3 is formed of a tubular part 32 and a shoulder 31 narrowed from the upper end of the tubular part 32 to connect with the mouth 2. A plurality of lateral grooves 5 formed to be annular along the circumferential direction are provided on the tubular part 32, and reduced pressure absorbing panels 6 are provided on the shoulder 31.