PROBLEM TO BE SOLVED: To provide a compression air supply control device capable of reliably detecting air leakage.SOLUTION: A compression air supply control device 2 to which a sealed air chamber 4 is connected and that supplies compression air to the air chamber 4 includes: a control circuit 11 for controlling drive power to be supplied to an air pump 8 and a pressure sensor 20 for measuring the pressure of an air supply passage to supply the compression air generated in the air pump 8 to the air chamber 4 and transmitting a pressure signal indicating the strength of the measured pressure to the control circuit 11. The control circuit 11 controls the drive power to be supplied to the air pump 8 so as to allow the measurement pressure indicated by the pressure signal to be predetermined set pressure on the basis of a difference between the measurement pressure and the set pressure. The control circuit 11 determines the existence of air leakage when the drive power is not lowered to be equal to or less than a predetermined abnormality determination threshold during a period till an air leakage determination time elapses after the measurement pressure has reached the set pressure.
