Image carrier unit and image forming apparatus

An image carrier unit, comprising:

• an image carrier that makes a rotation and has a charge transportation layer on an outer surface, the charge transportation layer containing a binding resin and at least one type of charge transporting material and covering the surface, and
• a cleaning blade that has a contact part contacting the surface of the image carrier and removes residue on the surface of the image carrier accompanying the rotation of the image carrier, wherein
• a charge transporting ratio of a first product to a second product is 183.0 or higher and 233.9 or lower,
• the first product is obtained from a peak molecular weight (A) of the binder resin of the charge transportation layer multiplied by an area ratio (B) of the charge transportation layer,
• the second product is obtained from a peak molecular weight (C) of the charge transporting material multiplied by an area ratio (D) of the charge transporting material,
• these peak molecular weights and the area ratios of the binding resin and the charge transporting material are measured by gel permeation chromatography measurement on the charge transportation layer.