To provide a sill cover which is to be mounted on a sill of an assembling building for use as a simplified shop etc. wherein the sill cover prevents infiltration of water droplets of rainwater, formed frost, etc., into the inside of the sill cover, and allows attachment/detachment of anchor bolts to/from the building even after assembly of the building.

The sill cover has a step portion formed along the longitudinal direction of the sill, for preventing infiltration of water droplets of rainwater, formed frost, etc., into the inside of the sill cover. Further the sill cover is made dividable along the width direction of the sill.