To provide a polypropylene-based resin composition for injection foam molding forming an injection foam molding having excellent light weight property and weather stability over a long period because thin injection filling is practicable and high foam magnification is obtained and an injection foam molding comprising the resin composition.

The polypropylene-based resin composition for injection foam molding contains following (A)-(D): (A) a polypropylene-based resin exhibiting strain hardening and having ≥2 cN melt tension; (B) polyolefin wax; (C) a weather resistant agent having a weight-average molecular weight (Mw) of ≥700, and a 2,2,6,6-tetramethyl piperidine skeleton in the molecule and having a structure formed by bonding one or more selected from a hydrogen atom, a 1-30C alkyl group, hydroxyalkyl group, alkoxy group and hydroxyalkoxy group with nitrogen atom of the 2,2,6,6-tetramethyl piperidine skeleton; and (D) a foaming agent.

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