To facilitate installation, transference, increase or decrease of the number, or the like of slot machines in a playing parlor and freely change the layout.

A lift 11 for medals, a lower tank 12, an upper tank 13, a lending machine 14 for medals, and a medal-recovering and fare-adjusting machine 15 are provided in the inside of a rectangular parallelepiped box 10 having a certain width in the front face, arranged adjacently to one side face of a slot machine body 1. And further, a supplementary passage 40 replenishing medals from the upper tank to the lending machine 15 of medals and the supplementary opening of the slot machine body, and a recovery passage collecting the medals from the recovery openings of the medal-recovering and fare- adjusting machine 15 and the slot machine body to the lower recovery opening, are provided respectively, and a money-insertion opening 20 of the lending machine 14 for medals, a card-insertion opening 21, a lending opening 22 of medals, a medal-recovery opening of the medal-recovering and fare-adjusting machine 15, and a control panel 24, are provided at the front face of the box.