A ramp bracket for a curtain airbag is constructed so that an open space between a front and a rear is divided into two portions, that is, an upper chamber and a lower chamber by a partition, and the front and the rear are separated from each other at an area defining the lower chamber. Such a ramp bracket allows the airbag to be smoothly deployed between a head liner and a pillar trim, and minimizes the injury to a passenger who collides with the ramp bracket.