An operating device, comprising: an operation panel comprising an operating unit (21, 48), said operating unit (21, 48) comprising a plurality of operation buttons; a gaze detection unit (28, 53) configured to detect a gaze of an operator who operates the operating unit (20, 48), wherein the gaze of an operator defines a portion of the operation panel which the operator is viewing; and a judgment unit (11, 41) configured to judge whether an operation of one of the plurality operation buttons of the operating unit (21, 48) is valid or invalid when the operation is received from the operator, wherein the plurality of operation buttons includes a first type of operation button and a second type of operation button; wherein each of the plurality of operation buttons is provided in a predetermined area; and wherein the judgement unit (11, 41) is configured to judge that the operation of the first type of operation button is invalid, in case that the gaze of the operator is not within the predetermined area of the first type of operation button when the operation of the first type of operation button is received, wherein the judgment unit (11, 41) does not include a judgment as to whether the gaze of the operator is within the predetermined area of the second type of operation button when the operation of the second type of operation button is received, and wherein the judgment unit (11, 41) is configured to judge that the operation of the second type of operation button is valid, in both cases that the gaze of the operator (a) is, or (b) is not within the predetermined area of the second type of operation button when the operation of the second type of operation button is received. an operation panel comprising an operating unit (21, 48), said operating unit (21, 48) comprising a plurality of operation buttons; a gaze detection unit (28, 53) configured to detect a gaze of an operator who operates the operating unit (20, 48), wherein the gaze of an operator defines a portion of the operation panel which the operator is viewing; and a judgment unit (11, 41) configured to judge whether an operation of one of the plurality operation buttons of the operating unit (21, 48) is valid or invalid when the operation is received from the operator, wherein the plurality of operation buttons includes a first type of operation button and a second type of operation button; wherein each of the plurality of operation buttons is provided in a predetermined area; and wherein the judgement unit (11, 41) is configured to judge that the operation of the first type of operation button is invalid, in case that the gaze of the operator is not within the predetermined area of the first type of operation button when the operation of the first type of operation button is received, wherein the judgment unit (11, 41) does not include a judgment as to whether the gaze of the operator is within the predetermined area of the second type of operation button when the operation of the second type of operation button is received, and wherein the judgment unit (11, 41) is configured to judge that the operation of the second type of operation button is valid, in both cases that the gaze of the operator (a) is, or (b) is not within the predetermined area of the second type of operation button when the operation of the second type of operation button is received.