A temporary pacing catheter having an integrally attached temporary pacemaker function is disclosed. The pacemaker integrally built in this catheter for temporary pacing has a very small size and can be fixed to the body of a patient, and therefore, the patient can be transferred conveniently. Furthermore, if this catheter is packaged in the sterilized conditions, problems or another's help required for the connection of the catheter to the pacemaker and the like operations in the conventional technique can be avoided, and therefore, the packaged catheter is suitably used for an emergency treatment. Moreover, if a balloon is attached and arranged so that when the balloon is inflated, the balloon envelopes an electrode at the distal end, the catheter can be caused to flow in the heart and blood vessel safely and promptly.