A microscope apparatus comprising: a stage (3, 3A) configured to mount a specimen thereon; an electric revolver configured to hold a plurality of objective lenses and configured to cause one of the plurality of objective lenses to be arranged on an observation light axis by a revolving motion, the electric revolver being configured to be electrically operated and revolve electrically; an input device configured to input a command for operating the electric revolver; a manual focusing device configured to adjust a relative distance between the stage (3, 3A) and the objective lenses; a focusing handle configured to to lift up and down the manual focusing device; an operation control device (7, 18) configured to control operation of the electric revolver; a state determining device configured to determine that the electric revolver is in an operable state when the objective lenses and the stage (3, 3A) are separated by a specified interval or more and to determine that the electric revolver is in an inoperable state when the objective lenses and the stage (3, 3A) are separated by less than the specified interval; and a restriction device configured to restrict an output of a control signal for commanding the operation to the operation control device (7, 18) when the command for operating the electric revolver is input by the input device if the state determining device determines that the electric revolver is in the inoperable state, wherein the electric revolver is attached to the manual focusing device, and the state determining device is one of a microswitch, a photo-interrupter, and a capacitive sensor, is arranged on a bottom or rear side surface of the electric revolver, and is configured to be activated when the manual focusing device is lifted down by rotation of the focusing handle. a stage (3, 3A) configured to mount a specimen thereon; an electric revolver configured to hold a plurality of objective lenses and configured to cause one of the plurality of objective lenses to be arranged on an observation light axis by a revolving motion, the electric revolver being configured to be electrically operated and revolve electrically; an input device configured to input a command for operating the electric revolver; a manual focusing device configured to adjust a relative distance between the stage (3, 3A) and the objective lenses; a focusing handle configured to to lift up and down the manual focusing device; an operation control device (7, 18) configured to control operation of the electric revolver; a state determining device configured to determine that the electric revolver is in an operable state when the objective lenses and the stage (3, 3A) are separated by a specified interval or more and to determine that the electric revolver is in an inoperable state when the objective lenses and the stage (3, 3A) are separated by less than the specified interval; and a restriction device configured to restrict an output of a control signal for commanding the operation to the operation control device (7, 18) when the command for operating the electric revolver is input by the input device if the state determining device determines that the electric revolver is in the inoperable state, wherein the electric revolver is attached to the manual focusing device, and the state determining device is one of a microswitch, a photo-interrupter, and a capacitive sensor, is arranged on a bottom or rear side surface of the electric revolver, and is configured to be activated when the manual focusing device is lifted down by rotation of the focusing handle.