To provide a floor drain tool in which a center and a height of a drain metal fitting can be self-adjusted.

At an upper part of a drain tool main body 1 provided with a circular waterproof plate 11 and plural drive anchors 10 on the back side of it, a center adjustment cover 2 of resin for a properly larger size than an outer diameter of a height adjustment connection pipe 5 in which a hole can be easily bored by using a tool at a construction site is threaded. A spacer 17 for placing concrete can be installed on a lower drain port. The height adjustment connection pipe 5 having a drain metal fitting frame 6 in which a drain perforated plate 7 is fitted screwed at an upper part is separately prepared. In this height adjustment connection pipe 5, an overturned bowl-like inner odor stop 8 and an outer odor stop 9 are fitted. The outer side of the height adjustment connection pipe 5 is threaded, a fixed frame 4 threaded to match it is prepared, and plural fixing screws 3 are provided at several positions.