Fixing mechanism and computer chassis

A computer chassis, comprising:

• a casing, comprising:
• a bottom plate;
• a plurality of side plates, connected to the bottom plate and defining an accommodating space together with the bottom plate;
• a circuit board, disposed on the casing and located in the accommodating space, and the circuit board having a first position limiting opening and a second position limiting opening;
• a fixing mechanism, assembled on the casing, and located in the accommodating space, the fixing mechanism comprising:
• a main member;
• and
• a first locking member, disposed at one side of the main member, and the first locking member comprises:
• a fixing portion, comprising a first part and a second part, and two ends of the first part being respectively connected to the main member and the second part;
• a support portion, connected to the fix portion, and the second part and the support portion being respectively located on two opposite surfaces of the first part;
• and
• a stop portion, connected to the support portion, and located on a bottom surface of the support portion;
• and
• an electronic device, assembled in the main member of the fixing mechanism, wherein the second part and the stop portion are respectively located in the first position limiting opening and the second position limiting opening to locking the first locking member to the circuit board, and the support portion is located on the circuit board to support the electronic device, so as to fix the fixing mechanism in the casing.