A resin composition for producing a stretched sheet, the resin composition comprising: a resin component consisting of a first thermoplastic resin and a second thermoplastic resin different from the first thermoplastic resin, and an inorganic substance powder, wherein a mass proportion of the first thermoplastic resin and the inorganic substance powder is 50:50 to 10:90; a content of the second thermoplastic resin is 1% by mass or more and 7% by mass or less relative to a total amount of the first thermoplastic resin and the inorganic substance powder, the first thermoplastic resin is a polyolefin-based resin, and the second thermoplastic resin is a polypropylene resin satisfying all of to below: a weight average molecular weight (Mw) is 10,000 or more and 400,000 or less; a molecular weight distribution (Mw/Mn) is 1.0 or more and 3.0 or less; a tensile modulus is 1 MPa or more and 600 MPa or less; 50% by mole or more of a monomer constituting the polypropylene resin is a propylene monomer; constituting units of the polypropylene resin satisfy (i) and/or (ii): (i) a constituting unit of ethylene is comprised in more than 0% by mole and 20% by mole or less; and (ii) a constituting unit of 1-butene is comprised in more than 0% by mole to 30% by mole or less; and a melting point (Tm-D) defined by a peak top observed at a highest temperature side of a melting endothermic curve obtained by using a differential scanning calorimeter, retaining a sample at -10°C under nitrogen atmosphere for 5 minutes, and thereafter raising a temperature at 10°C/minute is 0°C or more and 120°C or less. a resin component consisting of a first thermoplastic resin and a second thermoplastic resin different from the first thermoplastic resin, and an inorganic substance powder, wherein a mass proportion of the first thermoplastic resin and the inorganic substance powder is 50:50 to 10:90; a content of the second thermoplastic resin is 1% by mass or more and 7% by mass or less relative to a total amount of the first thermoplastic resin and the inorganic substance powder, the first thermoplastic resin is a polyolefin-based resin, and the second thermoplastic resin is a polypropylene resin satisfying all of to below: a weight average molecular weight (Mw) is 10,000 or more and 400,000 or less; a molecular weight distribution (Mw/Mn) is 1.0 or more and 3.0 or less; a tensile modulus is 1 MPa or more and 600 MPa or less; 50% by mole or more of a monomer constituting the polypropylene resin is a propylene monomer; constituting units of the polypropylene resin satisfy (i) and/or (ii): (i) a constituting unit of ethylene is comprised in more than 0% by mole and 20% by mole or less; and (ii) a constituting unit of 1-butene is comprised in more than 0% by mole to 30% by mole or less; and a melting point (Tm-D) defined by a peak top observed at a highest temperature side of a melting endothermic curve obtained by using a differential scanning calorimeter, retaining a sample at -10°C under nitrogen atmosphere for 5 minutes, and thereafter raising a temperature at 10°C/minute is 0°C or more and 120°C or less. a weight average molecular weight (Mw) is 10,000 or more and 400,000 or less; a molecular weight distribution (Mw/Mn) is 1.0 or more and 3.0 or less; a tensile modulus is 1 MPa or more and 600 MPa or less; 50% by mole or more of a monomer constituting the polypropylene resin is a propylene monomer; constituting units of the polypropylene resin satisfy (i) and/or (ii): (i) a constituting unit of ethylene is comprised in more than 0% by mole and 20% by mole or less; and (ii) a constituting unit of 1-butene is comprised in more than 0% by mole to 30% by mole or less; and (i) a constituting unit of ethylene is comprised in more than 0% by mole and 20% by mole or less; and (ii) a constituting unit of 1-butene is comprised in more than 0% by mole to 30% by mole or less; and a melting point (Tm-D) defined by a peak top observed at a highest temperature side of a melting endothermic curve obtained by using a differential scanning calorimeter, retaining a sample at -10°C under nitrogen atmosphere for 5 minutes, and thereafter raising a temperature at 10°C/minute is 0°C or more and 120°C or less.