To provide a resin composition excellent in all of heat resistance, transparency, impact resistance and drawability.

The resin composition is fabricated which contains as a main component a mixture (X) comprising a polytrimethylene terephthalate (A), and a polyesteric resin (B), wherein the polyesteric resin (B) has a glass transition temperature of ≥90°C and ≤140°C, and exhibits no crystal melting peak when being heated from -40°C to 250°C at a temperature-rise rate of 10°C/min in a differential scanning calorimetry; and the mixture (X) has a single glass transition temperature, which is higher than that of the polytrimethylene terephthalate (A) and lower than that of the polyesteric resin (B).