PURPOSE: To equip an oxide superconductive current lead with an electrode low in resistance by soaking an oxide superconductor in fused liquefied substance of alloy of In, Ga, Ag, etc., where there is no influence in superconductive property and the electric property is small and the melting point is low.

CONSTITUTION: Selecting the composition of 2:96.8 in the atomic ratio of Ag to In, those are fused in a crucible, and a bismuth oxide superconductor is soaked in it to make an electrode. The temperature of the said bismuth oxide superconductor is preheated to 175°C. This is one which is higher by about 10% than a eutectic temperature of 156°C. As a result, the contact resistance of the electrode being made is 10-8Ωcm2 at 77K. The contact resistance R=10-8Ωcm2 being gotten this way is substituted for Q=I2R to calculate joule heat. Defining that the application current I=l000A and that the contact area of an electrode part is 1cm2, it follows that Q=10-2W, and the numerical value without problem as calorific value can be gotten.