Chassis frame for electric vehicle

A chassis frame for an electric vehicle, comprising:

• a first frame and a second frame spaced apart from each other in a longitudinal direction of the electric vehicle;
• a center frame disposed between the first frame and the second frame, and configured to have side members spaced apart from each other in a widthwise direction of the electric vehicle;
• a first fastener, which extends from the first frame, and is fastened to a first side of a side member of the side members;
• and
• a second fastener, which extends from the second frame, and is fastened to a second side of the side member,
• wherein the first fastener and the second fastener are configured to be in contact with entire peripheries of the side member, and
• wherein the side member comprises
• a first body extending in the longitudinal direction of the electric vehicle, and being configured to form a first periphery of the side member;
• a second body extending in the longitudinal direction of the electric vehicle, and being configured to form a second periphery of the side member;
• a first extension part protruding in the longitudinal direction of the electric vehicle from a first end of the second body;
• and
• a second extension part protruding in the longitudinal direction of the electric vehicle from a second end of the second body.