PURPOSE: To make a horn button convenient when it is used to adjust her makeup, particularly when a female driver gets off a car in a device where a mirror is arranged on an automobile horn button installed on a steering wheel and her own face can be easily looked at while the driver is staying still on an operation seat.

CONSTITUTION: A mirror 3 is installed on a bearing of a horn button 1 by shafts 4 and 4, and this horn button 1 is installed on a steering wheel. When the mirror 3 is required, a mirror surface of the mirror 3 is faced up. It does not become an eyesore in driving when it is turned over.