A testing apparatus (A, B) for a DC circuit breaker that breaks a DC current, the testing apparatus comprising: a current source circuit (A) that supplies a current equivalent to an accident current to the DC circuit breaker ; and a voltage source circuit (B) that supplies a recovery voltage to the DC circuit breaker , wherein the current source circuit (A) 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 (B) 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 (B) to be equal to or smaller than 1/1000 of the current equivalent to the accident current. a current source circuit (A) that supplies a current equivalent to an accident current to the DC circuit breaker ; and a voltage source circuit (B) that supplies a recovery voltage to the DC circuit breaker , wherein the current source circuit (A) 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 (B) 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 (B) 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 (B) 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 (B) 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 (B) to be equal to or smaller than 1/1000 of the current equivalent to the accident current. <EOS>