Attitude control device

An attitude control device mounted on a radio-controlled model airplane, which is a controlled object controlled based on a control signal received from an external device, comprising:

• a calculation part configured to selectively output a first aileron control signal, which is input as the control signal, and a second aileron control signal, which is calculated based on the roll angle of the controlled object to maintain the controlled object in a horizontal state,
• wherein the calculation part selects and outputs the second aileron control signal when the following conditions are satisfied:
• turning on of a function is instructed by a function setting signal received from the external device;
• the first aileron control signal is a signal indicating neutral;
• the roll angle of the controlled object is within a set angle;
• and a pitch angle of the controlled object is within a set angle.