To provide fire escape stairs capable of being usually used for the regular outdoor stairs and being used for an escape slide in the case of emergency such as fire or the like.

A plurality of treads 2 are provided on an inclined sill 1 in the shape of stairs, the rear end as the sill 1 side of each of the treads 2 is pivoted in a rotatable manner, at the same time, both side ends in the front of the tread 2 are pivoted on a supporting bar member 3 provided parallel with the sill 1 on the right above the tread 2 in a rotatable manner, the supporting bar member 3 is slidable in either direction by a lifting machine 4, at the same time, both up and down ends are fixed with a pin bolt 5 in a detachable manner, the pin bolt 5 is removed to slide the supporting bar member 3 forward, the treads 2 are rotated with the rear end of each of them as the shaft, and the slide 2A is formed of the treads 2.