To provide a sill material easy to be manufactured, easy to execute working, and excellent in adaptability for a dimensional change and a deformation of a base material.

This sill material 10 includes a sliding door moving groove part 14 stored attachably and detachably in a recessed groove part 13 of the base material 12 arranged on a floor material 11 in a sill installation area of a building, a pair of left and right rib-like elastic engagement parts 16 respectively abutting engageably and disengageably on left and right inner faces 15 of the recessed groove part 13, under the condition stored in the recessed groove part 13 together with the sliding door moving groove part 14, and cover parts 18, 19 extended respectively from upper edge parts 14a, 14a in sliding door moving groove part 14 both sides along width expansion directions thereof, in order to cover left and right upper face parts 17 of the base material 12. The cover parts 18, 19 are also extended to cover a boundary part T between the base material 12 and an adjacent floor face material 20, and one part of an upper face of the floor face material.