A disclosed flame-retardant polypropylene composition contains: a random copolymer polypropylene as a synthetic resin component; and a component (A) and a component (B) as flame retardant components, the component (A) being one or more melamine salts selected from the group consisting of melamine orthophosphate, melamine pyrophosphate, and melamine polyphosphate, and the component (B) being one or more piperazine salts selected from the group consisting of piperazine orthophosphate, piperazine pyrophosphate, and piperazine polyphosphate. Furthermore, as a flame retardant component, the flame-retardant polypropylene composition preferably further contains zinc oxide as a component (C). Also, as a synthetic resin component, the flame-retardant polypropylene composition preferably further contains a styrene-based thermoplastic elastomer.