Synthetic resin container having a rectangular tubular shape

A synthetic resin container, comprising:

• a body part having a rectangular tubular shape with edges removed from corner parts, the body part having an upper end and a lower end;
• a bottom part that forms a leg part, the bottom part being connected to the lower end of the body part;
• a shoulder part having a substantially rectangular tubular shape that is continuous with the body part, the shoulder part being erected on and connected to the upper end of the body part;
• a cylindrical mouth tube part erected at an upper end of the shoulder part;
• and
• groove ribs having a vertical groove form are depressed at the centers in a width direction of flat wall portions of shoulder lower end parts, which are the portions of the shoulder part that connect with the body part.