A dust collector comprising: a dust collection portion (41, 42) configured to suck dust through a dust collection hose; a communication portion (61, 62) configured to wirelessly communicate with an electric working machine; an interlock operation control portion (64, 50) configured to make the dust collection portion (41, 42) perform an interlock operation with the electric working machine when the communication portion (61, 62) receives an interlock command transmitted from the electric working machine, the interlock operation control portion (64, 50) comprising a storage portion in which identification information is stored, the identification information being specific to the electric working machine with which the dust collection portion (41, 42) is to be made to perform the interlock operation; a dust collector main body that comprises at least the dust collection portion (41, 42) and that is configured to operate by receiving a power supply from an external alternating current power source; and a communication unit that comprises at least the communication portion (61, 62) and configured to receive the interlock command wirelessly transmitted from the electric working machine to output an operation command to the dust collector main body, characterized in that the communication unit is attached to the dust collector main body, wherein the dust collector main body comprises an isolation device (48, 52) configured to electrically isolate the alternating current power source from the communication unit, and wherein the isolation device (52, 48) comprises a contactless circuit configured to contactlessly transmit a signal between an operation portion and the communication unit, the operation portion being configured to operate by receiving a power supply from the alternating current power source. a dust collection portion (41, 42) configured to suck dust through a dust collection hose; a communication portion (61, 62) configured to wirelessly communicate with an electric working machine; an interlock operation control portion (64, 50) configured to make the dust collection portion (41, 42) perform an interlock operation with the electric working machine when the communication portion (61, 62) receives an interlock command transmitted from the electric working machine, the interlock operation control portion (64, 50) comprising a storage portion in which identification information is stored, the identification information being specific to the electric working machine with which the dust collection portion (41, 42) is to be made to perform the interlock operation; a dust collector main body that comprises at least the dust collection portion (41, 42) and that is configured to operate by receiving a power supply from an external alternating current power source; and a communication unit that comprises at least the communication portion (61, 62) and configured to receive the interlock command wirelessly transmitted from the electric working machine to output an operation command to the dust collector main body, characterized in that the communication unit is attached to the dust collector main body, wherein the dust collector main body comprises an isolation device (48, 52) configured to electrically isolate the alternating current power source from the communication unit, and wherein the isolation device (52, 48) comprises a contactless circuit configured to contactlessly transmit a signal between an operation portion and the communication unit, the operation portion being configured to operate by receiving a power supply from the alternating current power source.