An image process means, comprising: an image forming mechanism configured to form an image; and an image bearing mechanism constituted to be detachably provided to an image forming apparatus, the image bearing mechanism comprising: an image bearing member configured to bear the image formed by the image forming mechanism; and a carrying means for carrying the image bearing member,wherein the image bearing member is in a hollow cylindrical shape and has first and second open end portions (106, 107) and an intermediate hollow portion arranged between and communicating with the first and second open end portions (106, 107), wherein the image bearing mechanism further comprises: a first flange including a first opening at a center portion thereof and arranged at the first open end portion of the image bearing member; and a second flange including a second opening at a center portion thereof and arranged at the second open end portion of the image bearing member, and, wherein the carrying means is inserted with its leading end into the intermediate hollow portion of the image bearing member through the first opening of the first flange and is passed through the second opening of the second flange, wherein the carrying means includes first and second end portions (106, 107) which are accommodated in the first opening of the first flange and the second opening of the second flange, respectively, characterized in that the first and second end portions (106, 107) have an outer radial diameter greater than other portions between the first and second end portions (106, 107) and smaller than an inner radial diameter of the first opening of the first flange and the second opening of the second flange. an image forming mechanism configured to form an image; and an image bearing mechanism constituted to be detachably provided to an image forming apparatus, the image bearing mechanism comprising: an image bearing member configured to bear the image formed by the image forming mechanism; and a carrying means for carrying the image bearing member,wherein the image bearing member is in a hollow cylindrical shape and has first and second open end portions (106, 107) and an intermediate hollow portion arranged between and communicating with the first and second open end portions (106, 107), wherein the image bearing mechanism further comprises: a first flange including a first opening at a center portion thereof and arranged at the first open end portion of the image bearing member; and a second flange including a second opening at a center portion thereof and arranged at the second open end portion of the image bearing member, and, wherein the carrying means is inserted with its leading end into the intermediate hollow portion of the image bearing member through the first opening of the first flange and is passed through the second opening of the second flange, wherein the carrying means includes first and second end portions (106, 107) which are accommodated in the first opening of the first flange and the second opening of the second flange, respectively, an image bearing member configured to bear the image formed by the image forming mechanism; and a carrying means for carrying the image bearing member,wherein the image bearing member is in a hollow cylindrical shape and has first and second open end portions (106, 107) and an intermediate hollow portion arranged between and communicating with the first and second open end portions (106, 107), wherein the image bearing mechanism further comprises: a first flange including a first opening at a center portion thereof and arranged at the first open end portion of the image bearing member; and a second flange including a second opening at a center portion thereof and arranged at the second open end portion of the image bearing member, and, wherein the carrying means is inserted with its leading end into the intermediate hollow portion of the image bearing member through the first opening of the first flange and is passed through the second opening of the second flange, wherein the carrying means includes first and second end portions (106, 107) which are accommodated in the first opening of the first flange and the second opening of the second flange, respectively, a first flange including a first opening at a center portion thereof and arranged at the first open end portion of the image bearing member; and a second flange including a second opening at a center portion thereof and arranged at the second open end portion of the image bearing member, and, wherein the carrying means is inserted with its leading end into the intermediate hollow portion of the image bearing member through the first opening of the first flange and is passed through the second opening of the second flange, wherein the carrying means includes first and second end portions (106, 107) which are accommodated in the first opening of the first flange and the second opening of the second flange, respectively,