A polymer film suitable for medical use characterized in that an average film thickness T 0 along a straight line D passing through a center of gravity of a two-dimensional projection such that the area of the polymer film is maximized, satisfies equation (a), an average value L of distances I from the center of gravity to edges in straight lines D passing through the center of gravity satisfies equation (b), a Young's modulus E, determined according to Strain-Induced Elastic Buckling Instability for Mechanical Measurements (SIEBIMM) method, described herein, satisfies equation (c), and a thickness deviation Δ defined by equation (d) satisfies equation (e). a 10 nm ≤ T 0 ≤ 1000 nm b 0.1 μ m ≤ L ≤ 500 μm c 0.01 GPa ≤ E ≤ 4.3 GPa Δ = 1 − T 1 / T 2 0.346 E × 10 − 9 − 1.499 < Δ < − 0.073 E × 10 − 9 + 0.316 wherein, in the straight lines D passing through the center of gravity of the two-dimensional projection such that the area of the polymer film is maximized, T 1 represents: an average film thickness of a region from I/2 to I of the distance I from the center of gravity to the edge, and T 2 represents: an average film thickness of a region from the center of gravity to I/4, T 1 and T 2 being calculated by atomic force microscopy, described herein, and the straight line D passing through the center of gravity of the two-dimensional projection means the following D 1 to D 4: a minor axis passing through the center of gravity: D 1, a major axis passing through the center of gravity: D 2, straight lines passing through the center of gravity and bisecting a wide angle and a narrow angle formed by the minor axis and the major axis respectively: D 3, D 4, wherein, in case where the minor axis and the major axis are the same or there are a plurality of them, two lines having the smallest difference between the wide angle and the narrow angle formed by the minor axis and the major axis are selected, and each average film thickness means an average value calculated using the four straight lines D 1 to D 4 selected according to the above, and a polymer constituting the polymer film is biocompatible. wherein, in the straight lines D passing through the center of gravity of the two-dimensional projection such that the area of the polymer film is maximized, T 1 represents: an average film thickness of a region from I/2 to I of the distance I from the center of gravity to the edge, and T 2 represents: an average film thickness of a region from the center of gravity to I/4, T 1 and T 2 being calculated by atomic force microscopy, described herein, and the straight line D passing through the center of gravity of the two-dimensional projection means the following D 1 to D 4: a minor axis passing through the center of gravity: D 1, a major axis passing through the center of gravity: D 2, straight lines passing through the center of gravity and bisecting a wide angle and a narrow angle formed by the minor axis and the major axis respectively: D 3, D 4, a minor axis passing through the center of gravity: D 1, a major axis passing through the center of gravity: D 2, straight lines passing through the center of gravity and bisecting a wide angle and a narrow angle formed by the minor axis and the major axis respectively: D 3, D 4, wherein, in case where the minor axis and the major axis are the same or there are a plurality of them, two lines having the smallest difference between the wide angle and the narrow angle formed by the minor axis and the major axis are selected, and each average film thickness means an average value calculated using the four straight lines D 1 to D 4 selected according to the above, and a polymer constituting the polymer film is biocompatible.