A snubber circuit configured to be connected to a power conversion main circuit, comprising: a first clamp circuit configured to, when a magnitude of a voltage between a pair of first voltage points (P11 P12) in a main circuit exceeds a first clamp value, absorb electrical energy of the main circuit from the pair of first voltage points (P11 P12) to clamp a voltage between the pair of first voltage points to the first clamp value; a second clamp circuit configured to, when a magnitude of a voltage between a pair of second voltage points (P21 P22) in the main circuit falls below a second clamp value, inject electrical energy to the main circuit from the pair of second voltage points (P21 P22) to clamp a voltage between the pair of second voltage points (P21 P22) to the second clamp value; and a voltage conversion circuit electrically connected to the first clamp circuit and the second clamp circuit and configured to perform voltage conversion between a first clamp voltage, across a first capacitive element of the first clamp circuit, and a second clamp voltage, across a second capacitive element of the second clamp circuit, the first clamp voltage defining the first clamp value, the second clamp voltage defining the second clamp value, characterized in that, one first voltage point of the pair of first voltage points (P11 P12) is located on a high-potential side, one second voltage point of the pair of second voltage points (P21 P22) is located on the high-potential side, and a potential at the one first voltage point is equal to a potential at the one second voltage point, the other first voltage point of the pair of first voltage points (P11 P12) is located on a low-potential side, the other second voltage point of the pair of second voltage points (P21 P22) is located on the low-potential side, and a potential at the other first voltage point is equal to a potential at the other second voltage point, and, the voltage conversion circuit is configured to step down the first clamp voltage to generate the second clamp voltage. a first clamp circuit configured to, when a magnitude of a voltage between a pair of first voltage points (P11 P12) in a main circuit exceeds a first clamp value, absorb electrical energy of the main circuit from the pair of first voltage points (P11 P12) to clamp a voltage between the pair of first voltage points to the first clamp value; a second clamp circuit configured to, when a magnitude of a voltage between a pair of second voltage points (P21 P22) in the main circuit falls below a second clamp value, inject electrical energy to the main circuit from the pair of second voltage points (P21 P22) to clamp a voltage between the pair of second voltage points (P21 P22) to the second clamp value; and a voltage conversion circuit electrically connected to the first clamp circuit and the second clamp circuit and configured to perform voltage conversion between a first clamp voltage, across a first capacitive element of the first clamp circuit, and a second clamp voltage, across a second capacitive element of the second clamp circuit, the first clamp voltage defining the first clamp value, the second clamp voltage defining the second clamp value, characterized in that, one first voltage point of the pair of first voltage points (P11 P12) is located on a high-potential side, one second voltage point of the pair of second voltage points (P21 P22) is located on the high-potential side, and a potential at the one first voltage point is equal to a potential at the one second voltage point, the other first voltage point of the pair of first voltage points (P11 P12) is located on a low-potential side, the other second voltage point of the pair of second voltage points (P21 P22) is located on the low-potential side, and a potential at the other first voltage point is equal to a potential at the other second voltage point, and, the voltage conversion circuit is configured to step down the first clamp voltage to generate the second clamp voltage.