PURPOSE: To provide a combined spring mechanism which can secure an approximately constant energizing force regardless of the shift distance of a lever.

CONSTITUTION: A combined spring mechanism consists of a 1st spring 12 which energizes an action lever 11 by the force proportional to the rotational angle of the lever 11, and a 2nd spring 13 which gradually energizes the lever 11 up to a prescribed point from the start point of its turning. And then energizes the lever in the opposite direction after the prescribed point. In such a constitution, the spring mechanism can secure an approximately constant energizing force regardless of the shift distance of the lever 11.