The image forming apparatus has an image bearing member bearing an image thereon, and a transfer member contacting with the image bearing member in a contact portion, the image on the image bearing member is transferred to a transfer medium in the contact portion by the transfer member, the Young's modulus of the image bearing member is equal to or greater than 210⁸ [N/m²] and equal to or less than 910⁹ [N/m²] and contact pressure P between the image bearing member and the transfer member is equal to or greater than 4.010⁴ [N/m²] and equal to or less than 7.310⁴ [N/m²]. Thereby, there is provided an image forming apparatus which prevents the deterioration of an image even if use is made of an image bearing member of high hardness.