To provide a resin-based roof material superior in flame retardant performance and in durability in long-term use, in the resin-based roof material used as a lightweight roof tile (a resin-based roof tile).

This resin-based roof material is formed by laminating a flame retardant synthetic resin layer 2 on a surface of an incombustible fiber reinforced synthetic resin layer 1. The resin-based roof material is formed by alternately forming a plurality of layers of the incombustible fiber reinforced synthetic resin layer and the flame retardant synthetic resin layer.