The Subconscious is a location in Riley's mind in Inside Out.
The Subconcious is a dark cavern that consists of a single floor that is lower than the other locations in Riley's mind, and is closed off by a giant door. Subconscious Guards Frank and Dave stand watch at the door.
Its purpose is to lock up and confine troublemakers. Because of this, it houses Riley's greatest fears, which appear as an exaggerated allegory. Such include a broccoli-like forest, the staircase leading to the basement, her grandmother's vacuum cleaner and Jangles the Clown.
After Bing Bong is arrested, he is imprisoned in Riley's Subconscious. However, Joy and Sadness allow themselves be captured in order to enter inside and rescue Bing Bong. They also free Jangles the Clown and use him to wake up Riley.