To structure a large-capacity vacuum circuit breaker that can increase a current shutdown capacity and enables its rated current to be increased, at least two vacuum circuit breaker units 1A, 1B are placed side by side and connected in parallel. These at least two vacuum circuit breaker units 1A, 1B are operated by a single common operating unit 10 to concurrently perform current shutdown operations. Each vacuum circuit breaker unit 1A, 1B has a vertical magnetic field generating means for generating a vertical magnetic field when an operation to shut down current is performed. The vertical magnetic field generating means is formed by vertical magnetic field electrodes 3, 4 provided in the vacuum container 2 of the vacuum circuit breaker unit 1A, 1B or an external coil 11 provided on the outer circumference of the vacuum container 2.