To prevent contact failure of a ground terminal in a ground terminal connecting device for a wiring duct.

This ground terminal connecting device for the wiring duct is insertable into an opening part 14 opened in a longitudinal direction of the wiring duct 13, and is provided with a connection main body part 2 in which a pair of guard-like support parts 8 are protruded on the circumference, the ground terminal 3 erected movably up and down to this connection main body part, and a spring body 4 in which spring force is given to this ground terminal toward its tip. Here, the ground terminal 3 is contactable to a ground wire 15 in which the tip part is wired in its wiring duct and furthermore in the longitudinal direction, and the support part 8 is movably fitted to a side ditch 18 formed on both sides in the wiring ducts 13 and further along its longitudinal direction, and then removable from the side ditches.