A projector device, a method of correcting trapezoidal distortion, and a distortion correction program stored in a recording medium are provided, each of which projects an image onto a projection surface, detects inclination of the projector device with respect to a horizontal surface to output an inclination angle value of the projector device, corrects trapezoidal distortion in an image to be projected based on the inclination angle value, determines whether an operation device of the projector device is being operated by a user to generate a determination result, and prohibits the projector device from performing trapezoidal distortion correction when the determination result indicates that the operation device is being operated by the user.