PURPOSE: To heighten holding force to a down pipe while preventing the degradation of down pipe fitting work performance.

CONSTITUTION: A down pipe fixture is provided with a holding member 2 and a fitting member 1. The holding member 2 has a pair of clamping pieces 21 provided opposedly so as to hold a down pipe B from both side faces, and a connecting piece 22 for connecting the base end parts of the clamping pieces 21; and the tip parts of the clamping pieces are provided with locking protruding parts 211 that can be engaged with grooves B1 provided on the side faces of the down pipe B. The fitting member 1 has a base 11 to be fixed to a building C by a fixing member 3, and a pair of fitting pieces 12 erected opposedly to the base 11; and the fitting pieces 12 are provided with locking protrusions 122. A channel part 23 with the outer width W1 of the bottom part narrower than the space of the fitting piece 12 and the outer width W2 of the opening end part wider than the space H of the fitting pieces 12 is formed in the outward protruding state at the connecting piece 22 of the holding member 2. Engaging holes 232 that can be engaged with the locking protrusions 122 of the fitting pieces 12 are formed at the side face of the channel part 23.