A fiscal board receiving case is provided. A management board receiving case includes a case main body and a lid connected to the case main body and receives a management board on which a memory storing data including fiscal information and a management board-side connector are mounted. A control board receiving case includes a case main body and a lid connected to the case main body and receives a control board on which a controller and a control board-side connector connected to the management board-side connector are mounted. The management board receiving case and the control board receiving case are configured such that one box-like body that receives at least the management board is formed while the management board-side connector and the control board-side connector are connected to each other by engaging the management board receiving case with the control board receiving case through engagement members provided in the cases. The management board receiving case and the control board receiving case are configured such that engagement between the cases and engagement between the case main body and the lid in each of the cases are irreversibly maintained after the cases are engaged with each other.