To provide a lid for a substrate storage container that can prevent the generation of water residue inside the lid when the lid is washed and dried.SOLUTION: A substrate storage container 1 used in semiconductor manufacturing processes includes a container body 10 for storing a substrate W and a lid 20 that can be detachably attached to an open front surface of the container body 10. The lid 20 has side portions 21c to 21f and a locking mechanism 24 for engaging an opening 11 of the container body 10 with the container body 10 and closing it. The side portions 21c to 21f have an exit/entry hole 21h through which the locking mechanism 24 can move freely back and forth and ventilation openings 21m and 21n.SELECTED DRAWING: Figure 2

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