Sample container and automatic analyzer

A sample container comprising:

• a containing unit that contains a sample and is inserted into a test tube;
• and
• a flange portion that is provided at an upper end of the containing unit and mounted on an open end portion of the test tube,
• wherein the containing unit has a tubular body portion and a cup-shaped bottom portion connected to the body portion,
• wherein, in the bottom portion, an angle formed by an inner wall continuous from the body portion and a central axis has a gradient of less than 20 degrees,
• wherein a concentric step difference is provided on a lower surface of the flange portion, and
• wherein a height of the step difference is equal to or higher than a height of an unevenness on an upper surface of a conveyance path to which the test tube is conveyed.