A chassis includes a housing, a partition, a movable member and a tray. The housing includes a top plate and a bottom plate, and the top plate is opposite to the bottom plate. An accommodating space is located between the top plate and the bottom plate. The bottom plate has a through hole. The partition is disposed in the accommodating space. The movable member is connected to the partition. The movable member is configured to move between a first position and a second position. The tray includes a latch member. When the movable member is located at the first position and the tray is placed into the accommodating space, the movable member is embedded into the through hole and the latch member engages with the movable member. When the movable member is located at the second position, the movable member disengages from the through hole.