The present invention provides a housing having a housing shell with an opening, a guidance component and a door leaf set. The guidance component is arranged in the housing shell and extending along the direction away from the opening. The door leaf set has a first door leaf and a second door leaf. The first door leaf is pivotally connected the housing shell to enable the first door leaf to rotate to a first position or a second position relative to the opening. Wherein when the first door leaf is positioned at the first position, the first door leaf shields a portion of the opening; when the first door leaf is positioned at the second position, the first door leaf extends into the housing shell and defines the first installation space with the guiding component. Wherein when the first door leaf is positioned at the first position, the second door leaf can rotate to a third position or a fourth position relative to the first door leaf; when the second door leaf is positioned at the third position, the second door leaf shields another portion of the opening; when the second door leaf is positioned at the fourth position, the second door leaf extends into the housing shell and defines the second installation space with the guiding component.