In a resin storage container, a transverse sectional shape of a shoulder part or a bottom part is formed in a regular nonagon. A part of corners of the shoulder part or the bottom part at three parts forming a regular triangle by the lines to connect the corners to each other, and a part of corners of a body part with the transverse sectional shape being formed in a hexagon at three parts forminga regular triangle formed by lines to connect the corners to each other are vertically arranged in one row parallel to the center line of the container. When the pressure in the container is dropped by the temperature drop of contents or the like, the stresses are exerted inside the body portion of the container in the direction in which the body portion is deformed in the regular triangular prism shape with the corners vertically arranged in one row as being an apex. Then, the strength of the container is increased against the force from any direction, the shape of the container becomes stable, and the resistance against buckling is high.