| 摘要 |
[PROBLEMS] When a plurality of containers are connected in a vertical direction, a concavity and a convexity in a side surface direction are fit to each other, and the containers are blow molded, a variation in a relative angle between an external thread portion of the neck portion of the side surface of the container connected and an internal thread portion provided on the bottom. [MEANS FOR SOLVING PROBLEMS] A container comprises: a housing which has a bottom, a cylindrical side wall placed upright on the bottom, and a neck portion in which the cylindrical side wall is squeezed at the leading end and on the exterior surface of which the external thread portion is provided, and which houses a content; and a receiving portion which is embedded in the bottom, which has the internal thread portion which is fit to the external thread portion, and in which the neck portion of the other container having the structure of the external thread portion can be screwed. A flange portion with a fitting groove which lacks a part of a circumference shape is provided on a position in a bottom direction from the lower end of the external thread portion of the neck portion. The receiving portion has a ceiling portion for closing the upper end of a cylindrical form. A difference is formed at least in the inner wall of the ceiling portion. When the receiving portion is placed on a supporting base having a difference which is fit to the difference, the rotation on the center axis of the cylindrical form can be disturbed.
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