An electronic balance comprising: a weighing pan on which a specimen is placed; a weighing mechanism joined to the weighing pan; a windshield including a weighing chamber(s) covering the weighing pan; an opening and closing mechanism configured to automatically open and close a door constituting a portion of a wall of the weighing chamber; a moving up/down mechanism for a built-in weight configured to automatically apply and remove the load of the built-in weight to and from the weighing mechanism; and a control unit configured to control the opening and closing mechanism and the moving up/down mechanism, and calculate a weighed value from a measurement value obtained by the weighing mechanism, and the electronic balance being configured to be capable of performing the following series of operations to according to a command from the control unit: the opening and closing mechanism opens the door, the moving up/down mechanism applies the load of the built-in weight to the weighing mechanism, the opening and closing mechanism closes the door, after a predetermined period of time elapses, the opening and closing mechanism opens the door, the moving up/down mechanism removes the load of the built-in weight from the weighing mechanism, the opening and closing mechanism closes the door, and the control unit performs zero-point adjustment of the weighed value. a weighing pan on which a specimen is placed; a weighing mechanism joined to the weighing pan; a windshield including a weighing chamber(s) covering the weighing pan; an opening and closing mechanism configured to automatically open and close a door constituting a portion of a wall of the weighing chamber; a moving up/down mechanism for a built-in weight configured to automatically apply and remove the load of the built-in weight to and from the weighing mechanism; and a control unit configured to control the opening and closing mechanism and the moving up/down mechanism, and calculate a weighed value from a measurement value obtained by the weighing mechanism, and the electronic balance being configured to be capable of performing the following series of operations to according to a command from the control unit: the opening and closing mechanism opens the door, the moving up/down mechanism applies the load of the built-in weight to the weighing mechanism, the opening and closing mechanism closes the door, after a predetermined period of time elapses, the opening and closing mechanism opens the door, the moving up/down mechanism removes the load of the built-in weight from the weighing mechanism, the opening and closing mechanism closes the door, and the control unit performs zero-point adjustment of the weighed value. the opening and closing mechanism opens the door, the moving up/down mechanism applies the load of the built-in weight to the weighing mechanism, the opening and closing mechanism closes the door, after a predetermined period of time elapses, the opening and closing mechanism opens the door, the moving up/down mechanism removes the load of the built-in weight from the weighing mechanism, the opening and closing mechanism closes the door, and the control unit performs zero-point adjustment of the weighed value.