POWER SUPPLY SYSTEM

A power supply system includes a first voltage converter (10) provided between a first power storage device (B1) and a power feed line (PL). The first voltage converter (10) includes a first reactor (L1), a first upper switching element (Q1), a first lower switching element (Q2) and a first shutoff device (50). The first shutoff device (50) is provided in a first path (70) between the other end (Y) of the first reactor (L1) and a connection point (X). The connection point (X) is a connection point between the power feed line (PL) and the second supply line (PL2). The first shutoff device (50) configured to shut off the first path (70) when short circuit failure occurs in the first upper switching element (Q1).