To effectively use compressed air in a tank and safely use a pneumatic tool in a compressor for the pneumatic tool used by connecting a low pressure pneumatic tool and a high pressure pneumatic tool to the tank of the compressor.

There are provided: a means for generating compressed air in the predetermined pressure range and storing the generated compressed air in the air tank; a first reducing valve set to the air tank for feeding the compressed air whose maximum pressure is in a first pressure range not less than 10 kg/cm2 to a first pneumatic tool via a first hose; and a second reducing valve set to the air tank for feeding the compressed air whose maximum pressure is in a second pressure range not greater than 10 kg/cm2 to a second pneumatic tool via a second hose. Interchangeability is not provided between a fluid coupling of the first reducing valve and the first hose, and a fluid coupling of the second reducing valve and the second hose with each other.