PURPOSE: To gauge the pressure at the cryogenic pump side easily with low cost by fixing a vacuum gauge directly on the wall face of cryogenic pump without employing a relay flange fixed with vacuum gauge.

CONSTITUTION: A hole 71 is penetrated through the wall face of pump container 7 to plant a gas flow-in path 72 of vacuum gauge 5 vertically. While a hole 61 is made through the wall face at the position of radiation shield 6 located in front of said path 72 to flow in gas in said shield 6 directly into vacuum gauge 5 thus to gauge the pressure in said shield efficiently by means of vacuum gauge 5. Consequently, relay member can be eliminated resulting in reduction of size and manufacturing cost.