To provide a dome-shaped metal spring which has superior durability capable of withstanding million times or more of breaking caused by clicks even if the outer diameter of the dome-shaped metal spring is especially miniaturized to 4 mm or less, and a switch sheet used especially for a cellular phone or the like which is superior in durability capable of withstanding million times or more of breaking caused by clicks and excellent in a click feeling without position drifts by using this dome-shaped metal spring.

Out of the total thickness of a shear fracturing surface and a fracturing surface in a thickness portion of a peripheral cross section of the dome-shaped metal spring, the dome-shaped metal spring is made to have a thickness ratio of the shear fracturing surface, which is at least 1/2 or more.