PURPOSE: To extremely reduce a measuring error due to the change in the temp. of a diaphragm type vacuum gauge, by covering a gauge frame body with a shield frame body through a vacuum space.

CONSTITUTION: A gauge frame body 1 is covered with a shield frame body 12 through a vacuum space 11. Because of this, even if the circumferential temp. changes, the vacuum space 11 functions as a heat insulating layer and, therefore, the change in he circumferential temp. is not almost exerted on the gauge frame body 1. As a result, a diaphragm 5 performs bending deformation corresponding only to the pressure change of a vacuum chamber 3 and, by this deformation, the vacuum degree of the vacuum chamber 3 can be measured accurately and inexpensively.