PURPOSE: To facilitate the pushing operation of push buttons by axially supporting a first push button and a second push button on the front surface of a control portion in a freely swingable manner, and further mounting these push buttons on the first and second swinging members provided adjacent to each other.

CONSTITUTION: The first push button 13 and the second push button 14 are axially supported on the front surface of the control part in a manner swingable around the shaft 16, and are mounted on first and second swinging members 15 and 18 which are provided adjacent to each other. As a result, even when a gas control unit and a water control unit are installed separately from each other, both push buttons 13 and 14 can be provided closely each other. Hence, the pushing operation of the push buttons can be carried out with ease.