A cyclone dust collector according to an exemplary embodiment of the present invention is provided with: a collection container having a cylindrical shape which extends in the front-rear direction, and having a front end surface and a rear end surface; an inflow section which is connected to the peripheral surface of the collection container and through which air enters; and an inner cylinder extending through the rear end surface and having a part disposed within the collection container. The inner cylinder has an outflow opening out of which the air flows, the outflow opening being formed inthe peripheral surface of the portion of the inner cylinder, which is located within the collection container. The rear end surface is wider than the front end surface, and the inflow section is disposed offset to the front side.