A direct-current circuit breaker , comprising: a first main circuit breaker inserted into a first direct-current line ; a first resonance circuit connected in parallel to the first main circuit breaker; a first energy absorption unit connected in parallel to the first main circuit breaker via the first resonance circuit; a second main circuit breaker inserted into a second direct-current line that branches off from the first direct-current line and returns to the first direct-current line; a first switch inserted upstream of the second main circuit breaker in the second direct-current line and connected in series to the second main circuit breaker; a second resonance circuit connected in parallel to the second main circuit breaker; a second energy absorption unit connected in parallel to the second main circuit breaker via the second resonance circuit; characterised by a first switch circuit unit including a first auxiliary circuit breaker and a second auxiliary circuit breaker that are connected in parallel, the first switch circuit unit being inserted into the first direct-current line; and a second switch circuit unit including a third auxiliary circuit breaker and a fourth auxiliary circuit breaker connected in parallel, the second switch circuit unit being inserted into the first direct-current line, wherein the first switch circuit unit is disposed on an upper side of a first connection point that is an upstream connection point of the first direct-current line and the second direct-current line, and the second switch circuit unit is disposed on a lower side of a second connection point that is a downstream connection point of the first direct-current line and the second direct-current line. a first main circuit breaker inserted into a first direct-current line ; a first resonance circuit connected in parallel to the first main circuit breaker; a first energy absorption unit connected in parallel to the first main circuit breaker via the first resonance circuit; a second main circuit breaker inserted into a second direct-current line that branches off from the first direct-current line and returns to the first direct-current line; a first switch inserted upstream of the second main circuit breaker in the second direct-current line and connected in series to the second main circuit breaker; a second resonance circuit connected in parallel to the second main circuit breaker; a second energy absorption unit connected in parallel to the second main circuit breaker via the second resonance circuit; characterised by a first switch circuit unit including a first auxiliary circuit breaker and a second auxiliary circuit breaker that are connected in parallel, the first switch circuit unit being inserted into the first direct-current line; and a second switch circuit unit including a third auxiliary circuit breaker and a fourth auxiliary circuit breaker connected in parallel, the second switch circuit unit being inserted into the first direct-current line, wherein the first switch circuit unit is disposed on an upper side of a first connection point that is an upstream connection point of the first direct-current line and the second direct-current line, and the second switch circuit unit is disposed on a lower side of a second connection point that is a downstream connection point of the first direct-current line and the second direct-current line. <EOS>