To provide an image carrier unit which can obtain a sure and stable contact state with an abutting member such as a hard roller, whose production is facilitated and which does not cause the deterioration of image quality.

By press-fitting a disk-like member 120 in both ends 141 of the flexible and thin cylindrical image carrier 140 provided with an image carrier layer formed on the surface of flexible and thin cylindrical base material the image carrier is supported. The image carrier unit is constituted to satisfy a condition 0<D3-D2≤5×102 t/(HCE) when it is assumed that the thickness of the base material is t (mm), the inside diameter thereof is D2 (mm) and the Young's modulus thereof is E (kgf/mm2), the outside diameter of the supporting surface 121 of the disk-like member is D3, the parallelism of the disk-like members obtained after press-fitting them in both ends of the image carrier is H (mm) and the concentricity thereof is C (mm).