A set value input device, comprising: a display in which a screen having at least one set value input area can be displayed; a touch detection portion; a first input portion which is displayed when the touch detection portion detects the set value input area is touched and which is to input a set value in the set value input area; a judging portion for judging, whether a second input portion is in an enabled state or in a disabled state, the second input portion being operable of the set value input screen, and inputting a set value when the set value input area is selected; and a control portion which disables the first input portion, makes one of the set value input areas selected if the second input portion is enabled, and which makes all the set value input areas non-selected if the second input portion is disabled.