To suitably house a various kinds of substantially rectangular substrates P with the use of a substrate housing container 1 for housing substantially circular substrates.SOLUTION: The substrate housing container 1 comprises: a container body 20 which has, on its front side, an opening 21 for inserting and extracting substrates; and a lid 40 which closes the opening 21. When the opening 21 is viewed from the front side, both right and left lateral surfaces inside the container body 20 are provided with shelf parts 30 for placing substantially circular substrates. Each of the shelf parts 30 has a plurality of shelf board parts 31 which are vertically spaced apart from one another. Support auxiliary members (support auxiliary trays 50) are detachably fitted so as to support the substantially rectangular substrates P by being bridged between the shelf board parts 31 paired at the same height of the shelf parts 30...

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