To provide a polypropylene-based resin composition excellent in heat resistance, transparency and a balance between sliding property and low temperature impact resistance.

This polypropylene-based resin composition containing a polypropylene-based copolymer comprises: 50 to 95% by weight of a polymer component (component A) containing propylene as a main component and having a melting point of higher than 155C; and 5 to 50% by weight of a copolymer component (component B) of propylene, ethylene and a 4C -olefin in which: the content (X) of a structure unit derived from propylene is 10% by weightX50% by weight; the content (Y) of a structure unit derived from ethylene is 50% by weightY70% by weight; the content (Z) of a structure unit derived from a 4C -olefin is 0% by weightZ20% by weight (with the proviso that the total of X, Y and Z is 100% by weight); and the weight ratio of the content (Z) of a structure unit derived from the 4C -olefin relative to the content (X) of a structure unit derived from propylene is 1 or less.