A testing apparatus (A, B) for a DC circuit breaker that breaks a DC current, the testing apparatus comprising: a current source circuit that supplies a current equivalent to an accident current to the DC circuit breaker; and a voltage source circuit that supplies a recovery voltage to the DC circuit breaker, wherein the current source circuit comprises: a short-circuiting generator which is connected to the DC circuit breaker, and which generates an AC current; an input switch unit which is connected between the short-circuiting generator and the DC circuit breaker, and which breaks or carries the current; a reactor to apply a transient voltage to the DC circuit breaker, the reactor being which is connected between the short-circuiting generator and the DC circuit breaker; and a mechanical circuit breaker which is connected between the reactor and the DC circuit breaker, wherein the voltage source circuit comprises: a voltage source capacitor to apply the recovery voltage; and a first resistor that is connected in series with the voltage source capacitor, wherein a resistance value of the first resistor is a value that causes the current which is supplied to the DC circuit breaker by the voltage source circuit to be equal to or smaller than 1/1000 of the current equivalent to the accident current. a current source circuit that supplies a current equivalent to an accident current to the DC circuit breaker; and a voltage source circuit that supplies a recovery voltage to the DC circuit breaker, wherein the current source circuit comprises: a short-circuiting generator which is connected to the DC circuit breaker, and which generates an AC current; an input switch unit which is connected between the short-circuiting generator and the DC circuit breaker, and which breaks or carries the current; a reactor to apply a transient voltage to the DC circuit breaker, the reactor being which is connected between the short-circuiting generator and the DC circuit breaker; and a mechanical circuit breaker which is connected between the reactor and the DC circuit breaker, wherein the voltage source circuit comprises: a voltage source capacitor to apply the recovery voltage; and a first resistor that is connected in series with the voltage source capacitor, wherein a resistance value of the first resistor is a value that causes the current which is supplied to the DC circuit breaker by the voltage source circuit to be equal to or smaller than 1/1000 of the current equivalent to the accident current. a short-circuiting generator which is connected to the DC circuit breaker, and which generates an AC current; an input switch unit which is connected between the short-circuiting generator and the DC circuit breaker, and which breaks or carries the current; a reactor to apply a transient voltage to the DC circuit breaker, the reactor being which is connected between the short-circuiting generator and the DC circuit breaker; and a mechanical circuit breaker which is connected between the reactor and the DC circuit breaker, wherein the voltage source circuit comprises: a voltage source capacitor to apply the recovery voltage; and a first resistor that is connected in series with the voltage source capacitor, wherein a resistance value of the first resistor is a value that causes the current which is supplied to the DC circuit breaker by the voltage source circuit to be equal to or smaller than 1/1000 of the current equivalent to the accident current. a voltage source capacitor to apply the recovery voltage; and a first resistor that is connected in series with the voltage source capacitor, wherein a resistance value of the first resistor is a value that causes the current which is supplied to the DC circuit breaker by the voltage source circuit to be equal to or smaller than 1/1000 of the current equivalent to the accident current.