To provide a demand equipment interlocking type cryogenic liquefied gas feeder capable of reliably performing the interlocking operation with a demand equipment connected thereto while avoiding wasteful consumption of liquefied gas and enhancing the cool-down efficiency.

The cryogenic liquefied gas feeder comprises a liquefied gas storage tank 1, a suction line 2 communicated with a liquid phase part 1a, a high-pressure gas feed line 4 having a pressure feed pump 3 and a vaporizer 4b and connected to the pressure feed pump 3, a circulation line 6 which is connected to the line 4 and the liquefied gas storage tank 1 and communicated with the vaporizer 4b and a gas phase part 1b, and a controller 10 to perform the valve opening control of each line and the drive control of the pressure feed pump 3. Cryogenic liquefied gas is allowed to flow into the circulation line 6 by the valve operation of the controller 10 to cool down the suction line 2 and the pressure feed pump 3. The controller 10 is controlled by interlocking a demand equipment 20 connected to the high-pressure gas feed line 4 with an operation control device 21 for performing the operational control, and cool-down is performed in an interlocking manner with the starting operation and the temporary stop of the demand equipment 20.