To provide an eaves gutter cutting tool easily operable without causing a step on a cut face of an eaves gutter.

A guide member 3 of this eaves gutter cutting tool 1 is formed by a guide member main body 11 and a connection member 12. The guide member main body 11 is constituted by a belt-like flat plate to have a front face 11a, a bottom face 11b, and a rear face 11c continuously to have a recessed cross section, and projections 13 are erected from the guide member main body 11 in both end parts in the direction of width of the guide member main body 11. A front lug locking part 14 and a rear lug locking part 15 locking into a front lug 9 and a rear lug 10 of the eaves gutter 2, respectively, are formed in both end parts in the direction of length of the guide member main body 11. Although the guide member main body 11 is divided into two parts by a slit 7 provided in a substantially central part of the guide member main body 11, these two divided parts of the guide member main body 11 are mutually and integrally connected by the connection member 12. A hook 21 is formed in one end part 20 of the connection member 12.