To easily perform steering wheel operation in a cutter having a dust collection function.

In the cutter including: a cutter body 2 having a saw cover 6 covering a radial outer side of a rotary blade 1 and a handle 9 with an upper arm 91 extending from an upper portion of the saw cover 6; and a duct collection cover detachably mounted to the cutter body 2 to cover one surface side of the rotary blade 1 for collecting cutting powder, an engaging portion is formed on the duct collection cover, and an engaging portion that is engaged with the engaged portion of the duct collection cover is formed on the cutter body 2. A lock member 50 that locks a state where the dust collection cover is mounted to the cutter body 2 and unlocks the state is formed on the cutter body 2. A storage recessed portion 80 is formed on a base portion 91a of the upper arm 91 of the handle 9. At least part of the lock member 50 is stored in the storage recessed portion 80.