To prevent insertion of dust and gravel into a guide groove in a sill.

This sill device for an elevator is provided with guide grooves 6, 7 formed in a sill 5, doors 1, 2 guided into the guide grooves 6, 7 via door shoes 3, 4, covering belts 8, 9 which are stored in the guide grooves 6, 7 freely movably and install their one ends to the doors 1, 2 while protrude the other ends from the end parts 5a of the sill 5, and weights 11 installed in the other ends of the covering belts 8, 9. According to opening action of the doors 1, 2, the covering belts 8, 9 close the guide grooves 6, 7.