HOUSING STRUCTURE AND PROCESSING DEVICE EQUIPPED WITH HOUSING STRUCTURE

A housing structure includes an upper housing at an upper side of a device housing, a lower housing at a lower side of the device housing, and a positioner that positions the upper housing on the lower housing. One side surface of the device housing has an opening extending astride the lower housing and the upper housing when the upper housing is positioned on the lower housing. The positioner includes a reference positioning element that is provided toward any one of four corners of a connection area between the lower housing and the upper housing and that has a reference hole provided in one of or each of the lower housing and the upper housing and a positioning reference pin fitted in the reference hole, an anti-rotation element that is provided toward another corner of the four corners excluding the corner near where the reference positioning element is provided and that has an anti-rotation pin provided at one of the lower housing and the upper housing and an anti-rotation hole that is provided in the other one of the lower housing and the upper housing, receives the anti-rotation pin, and suppresses rotation of the upper housing relative to the lower housing about the reference positioning element, and position regulation elements that are respectively provided toward corners, of the four corners, located at opposite sides of the opening such that the one side surface having the opening is interposed between the corners. The position regulation elements individually have position regulation pins provided at one of the lower housing and the upper housing and position regulation holes that are provided in the other one of the lower housing and the upper housing, receive the position regulation pins, and positionally regulate the corners located at the opposite sides of the opening.