Receiving case and chassis having the same

A chassis, comprising:

• a housing, comprising a bottom plate;
• and
• a receiving case, disposed on the bottom plate, and comprising:
• a first base, comprising two first side walls disposed in an opposite manner and two butting portions, wherein one of the two first side walls comprises a first sliding portion, one of the two first side walls comprises a multi-segment positioning portion, and each of the butting portions is extended outward from one of the side walls;
• a second base, comprising two second side walls disposed in an opposite manner, wherein one of the two second side walls comprises a second sliding portion, and one of the two second side walls comprises a multi-segment alignment portion;
• and
• a cover, comprising two engaging portions, wherein each of the butting portions is engaged with one of the engaging portions, so that the cover rotatably covers the first base, wherein
• the first sliding portion is connected to the second sliding portion, and the multi-segment positioning portion of the first base is adapted to be engaged with the multi-segment alignment portion of the second base, so that the second base is slidably disposed on the first base.