To provide an outer frame which is available also in a Pachinko machine formed by mounting a hook for locking the Pachinko machine to the outer frame, in a different position.

A locking member 60 for locking the hook 70 mounted on the rear surface of the Pachinko machine 1 is attached to a projection 21j on a right side plate 21 so as to adjust the attachment position in the vertical direction. The locking member 60 includes a locking piece 61, and a bolt 61 and a nut for attaching the locking piece 61. A slit 21e is formed vertically in the projection 21j. Bolts 62 are inserted into bolt insertion holes in the locking piece 61, respectively. Each bolt 62 projects through the slit 21e from the rear surface of the projection 21j, and the nut (not shown) is screwed with each of the projecting bolts 62.