According to one embodiment, a substrate storage container includes a transport component configured to be mountable to a container body by being relatively displaced with respect to the container body from the rear side to the front side. The container body has a container body-side protrusion protruding upward. The transport component has a transport component-side protrusion protruding downward. In a mounted state, the transport component-side protrusion is engaged with the front side of the container body-side protrusion to be restricted from being displaced backwards. When a predetermined load is applied to the transport component-side protrusion upwardly, the transport component-side protrusion is displaced by a smaller amount than the container body-side protrusion displaced when the predetermined load is applied to the container body-side protrusion downwardly.