A connecting/holding machine 30 of a cash container according to the present invention holds a cash container 15 having a bottom portion 15a and a back face side portion 15d and provided with first terminal portions 22 and 23 and a fitting-in hole 47 in its back face side portion 15d. This connecting/holding machine 30 includes a holding base 70 in which a mounting portion 40 capable of mounting the cash container 15 and a back face portion 42 standing from the mounting portion 40 are constituted in conformity with an external shape of the cash container 15. The back face portion 42 includes second terminal portions 37 and 38 capable of being connected to the first terminal portions 22 and 23 at positions corresponding to the first terminal portions 22 and 23. The back face portion 42 also includes an engaging protrusion 45 capable of fitting in the fitting-in hole 47 at a position corresponding to the fitting-in hole 47.