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The present work describes measurements of the superconducting-tunneling-junction capacitance C g , which show that C g increases when one of the junction metals undergoes a superconducting transition. C g increases as long as the temperature decreases, although at lower temperatures saturation of this effect seems to exist. Moreover, at fixed T, a sufficiently strong magnetic field restores the C g value, which is measured when both metals are in the normal state. This phenomenon seems to depend strongly on the insulating-layer thickness. A qualitative discussion of the experimental results in terms of the penetration of the electric field into the metal electrodes is given.