CLAIMS
1. A polypropylene film having a crystal orientation degree of an a-crystal (110) plane measured by wide-angle X-ray diffractometry of 0.78 or more, and having a sum of thermal shrinkage rates in a width direction and a longitudinal direction after being subjected to heat treatment at 120°C for 10 minutes of 4.0% or less.
2. The polypropylene film according to claim 1, having a relationship between a stress at 5% elongation in the width direction (TD-F5 value) and a stress at 5% elongation in the longitudinal direction (MD-F5 value) of (MD-F5 value)/(TD-F5 value) > 0.4.
3. The polypropylene film according to claim 1 or 2, having a relationship between a maximum strength (St) and a maximum elongation (El) in the longitudinal direction of (St)/(El) > 1.2.
4. The polypropylene film according to any one of claims 1
to 3, having a stress at 50% elongation in the longitudinal
direction at 125°C (F50 value) of 13 MPa or more.

5. The polypropylene film according to any one of claims 1 to 4, having a volume resistivity at 110°C of 5 x 1014 Q-cm or more.
6. The polypropylene film according to any one of claims 1 to 5, having a glossiness of at least one surface of 130% or more and less than 150%, and having, when being stacked, a coefficient of static friction (|is) of 0.1 or more and 1.5 or less.
7. The polypropylene film according to any one of claims 1 to 6, having a nitrogen element composition amount detected by X-ray photoelectron spectroscopy (XPS) of 1 atomic% or more in at least one surface.
8. The polypropylene film according to any one of claims 1 to 7, which is obtained by subjecting at least one surface to plasma treatment.
9. A polypropylene film having a thickness unevenness in a longitudinal direction of 0.1 to 6.0%, and having a sum of a maximum strength in the longitudinal direction and a maximum strength in a width direction of 400 MPa or more.
10. The polypropylene film according to claim 9, having a

thermal shrinkage rate in the longitudinal direction after heat treatment at 125°C for 15 minutes and a thermal shrinkage rate in the width direction after heat treatment at 125°C for 15 minutes of both 2% or less.
11. The polypropylene film according to claim 9 or 10, having a total haze of 0.01 to 1.0%.
12. The polypropylene film according to any one of claims 9 to 11, which is obtained by stretching an unstretched polypropylene film having a mesomorphic phase structure 2 times or more in at least one direction.
13. A metal membrane layered film comprising the polypropylene film according to any one of claims 1 to 12, and a metal membrane provided on at least one surface of the polypropylene film.
14. A film capacitor comprising the metal membrane layered film according to claim 13.
15. A method for manufacturing a polypropylene film, the method comprising a step of subjecting at least one surface of the polypropylene film according to any one of claims 1 to 7 to plasma treatment.

16. A method for manufacturing the polypropylene film according to any one of claims 9 to 11, the method comprising a step of stretching an unstretched polypropylene film having a mesomorphic phase structure 2 times or more in at least one direction.
17 . A method for manufacturing a metal membrane layered film, the method comprising a metal membrane providing step of providing a metal membrane to at least one surface of a polypropylene film obtained by the manufacturing method according to claim 15 or 16.
18. A method for manufacturing a film capacitor, the method comprising using a metal membrane layered film obtained by the manufacturing method according to claim 17.