A housing assembly, comprising: a housing, wherein at least one hollowed-out portion is disposed on the housing, and the hollowed-out portion penetrates through the housing; at least one fastening structure, wherein the fastening structure is fastened to the housing; and a notched portion is disposed on the fastening structure; and a support structure, wherein at least one support hole is disposed on the support structure, and the support hole penetrates through the support structure, wherein at least a part of the fastening structure passes through the support hole, and a portion of the support structure close to the support hole is fastened to the notched portion; the fastening structure comprises a protrusion portion and a first part and a second part that are located on one side of the protrusion portion that is away from the housing; one end of the first part is connected to the protrusion portion, and the other end of the first part is connected to the second part; an extension direction of the second part is the same as an extension direction of the protrusion portion, and both are parallel to a plane in which the housing is located; an extension direction of the first part is different from the extension direction of the second part; the protrusion portion, the first part, and the second part are combined to form the notched portion; and a material of the housing comprises a metal material, wherein, along an extension direction of the second part, a distance from a surface on one side of at least a part of the second part that is close to the housing to the housing gradually decreases. a housing, wherein at least one hollowed-out portion is disposed on the housing, and the hollowed-out portion penetrates through the housing; at least one fastening structure, wherein the fastening structure is fastened to the housing; and a notched portion is disposed on the fastening structure; and a support structure, wherein at least one support hole is disposed on the support structure, and the support hole penetrates through the support structure, wherein at least a part of the fastening structure passes through the support hole, and a portion of the support structure close to the support hole is fastened to the notched portion; the fastening structure comprises a protrusion portion and a first part and a second part that are located on one side of the protrusion portion that is away from the housing; one end of the first part is connected to the protrusion portion, and the other end of the first part is connected to the second part; an extension direction of the second part is the same as an extension direction of the protrusion portion, and both are parallel to a plane in which the housing is located; an extension direction of the first part is different from the extension direction of the second part; the protrusion portion, the first part, and the second part are combined to form the notched portion; and a material of the housing comprises a metal material, wherein, along an extension direction of the second part, a distance from a surface on one side of at least a part of the second part that is close to the housing to the housing gradually decreases.