PURPOSE: To improve the secondary processability, rigidity in ambient and high-temperature of a molded sheet, by mixing a specified crystalline propylene homopolymer with a specified aluminum salt of a cyclic phosphorus compound.

CONSTITUTION: 100pts.wt. crystalline propylene homopolymer is mixed with 0.01W1pt.wt. aluminum salt of a cyclic phosphorus compound of formula 1 (wherein R1WR8 are each H, a 1W8C alkyl, cycloalkyl or the like). Said homopolymer is a crystalline propylene homopolymer satisfying formula II (wherein [η]H is the intrinsic viscosity of a polymer part of a higher MW selected from polymer parts formed in the first stage and the second and latter stages when propylene is polymerized in multiple stages, wherein 35W65wt.% portion of the entire polymer is formed in the first stage and 65W35wt.% portion is formed in the second and latter stages, and [η]L is the intrinsic viscosity of the part of the lower MW) and satisfying the relationship of formula III, wherein P is the isotactic pentad fraction of the entire polymer, and MFR is a melt flow rate (an amount of a molten resin discharged for 10min at 230°C under a load of 2.16kg).